题目选项分析

Farmer: Worldwide, just three grain crops-rice, wheat, and corn-account for most human caloric intake. To maintain this level of caloric intake and also keep pace with global population growth, yields per acre from each of these crops will have to increase at least 1.5 percent every year, given that the supply of cultivated land is diminishing. Therefore, the government should increase funding for research into new ways to improve yields

Which of the following is an assumption on which the farmers argument depends?

【选项】Increasing the yields per acre of rice, wheat, and corn is more important than increasing the yields per acre of other crops