Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.ДЄ. Thus the rising population was fed by a more intensive agriculture, applying more labor and fertilizer to the land.ДЎ. There was also a gain in farm tools, draft animals, and fertilizer, to say nothing of the population growth itself, which increased half again as fast as cultivated land area and so increased the ratio of human hands available per unit of land. From 1400 to 1900 the total of irrigated land seems to have increased almost three times. Productivity in agriculture was also improved by capital investments, first of all in irrigation. The sweet potato, growing in sandy soil and providing more food energy per unit of land than other crops, became the main food of the poor in much of the South China rice area. Corn, for instance, can be grown on the dry soil and marginal hill land of North China, where it is used for food, fuel, and fodder and provides something like one-seventh of the food energy available in the area. New crops such as corn (maize) and sweet potatoes as well as peanuts and tobacco were introduced from the Americas. This technological advance took many forms: one was the continual introduction from the south of earlier-ripening varieties of rice, which made possible double-cropping (the production of two harvests per year from one field). Perhaps half to the increase of cultivated area, particularly by migration and settlement in the central and western provinces, and half to greater productivity-the farmersвЂ™ success in raising more crops per unit of land. Assuming that ChinaвЂ™s population in 1400 was about 80 million, the economist Dwight Perkins concludes that its growth to 700 million or more in the 1960s was made possible by a steady increase in the grain supply, which evidently grew five or six times between 14 and rose another 50 percent between 18. But of most critical importance was the food supply.Д¬onfronted with a multitude of unreliable figures, economists have compared the population records with the aggregate data for cultivated land area and grain production in the six centuries since 1368. Control of disease, like the checking of smallpox by variolation may have been important. There was also an increase in foreign trade through Guangzhou (southern China) and some improvement of transportation within the empire. Among these is the almost complete internal peace maintained under Manchu rule during the eighteenth century. To explain this sudden increase we cannot point to factors constant in Chinese society but must find conditions or a combination of factors that were newly effective in this period. If, with greater caution, we assume lower totals in the early eighteenth century and only 400 million in 1850, we still face a startling fact: something like a doubling of the vast Chinese population in the century before Western contact, foreign trade, and industrialization could have had much effect. If we accept these totals, we are confronted with a situation in which the Chinese population doubled in the 50 years from 1790 to 1840. The transition between the Ming and Qing dynasties (the seventeenth century) may have seen a decline, but from 1741 to 1851 the annual figures rose steadily and spectacularly, perhaps beginning with 143 million and ending with 432 million. It is estimated that the Chinese population by 1600 was close to 150 million. In the Western experience, commerce provided the conditions that allowed industrialization to get started, which in turn led to growth in science, technology, industry, transport, communications, social change, and the like that we group under the broad term of вЂњdevelopment.вЂќ However, the massive increase in population that in Europe was at first attributed to industrialization starting in the eighteenth century occurred also and at the same period in China, even though there was no comparable industrialization. Increases in population have usually been accompanied (indeed facilitated) by an increase in trade.

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