OG-149的D选项是啥意思？（句子和题目都贴出了）

149. The cotton farms of Country Q became so productive that the market could not absorb all that they
produced. Consequently, cotton prices fell. The government tried to boost cotton prices by offering farmers who
took 25 percent of their cotton acreage out of production direct support payments up to a specified maximum per
farm.
The government’s program, if successful, will not be a net burden on the budget. Which of the following, if
true, is the best basis for an explanation of how this could be so?
(A) Depressed cotton prices meant operating losses for cotton farms, and the government lost revenue from
taxes on farm profits.
(B) Cotton production in several counties other than Q declined slightly the year that the support-payment
program went into effect in Q.
(C) The first year that the support-payment program was in effect, cotton acreage in Q was 5% below its level
in the base year for the program.
(D) The specified maximum per farm meant that for very large cotton farms the support payments were less
per acre for those acres that were withdrawn from production than they were for smaller farms.
(E) Farmers who wished to qualify for support payments could not use the cotton acreage that was withdrawn
from production to grow any other crop.

D看不懂～好长的句子．．．吓晕了

NN帮助翻译一下～小女子谢谢拉