Which of the following most logically completes the argument below?

　　下列哪一个选项最能有逻辑地完成下面的论证?

　　Using broad-spectrum weed killers on weeds that are competing withcrops for sunlight, water, and nutrients presents a difficulty: how to keep thecrop from being killed along with the weeds. For at least some food crops,specially treated seed that produces plants resistant to weed killers is underdevelopment. This resistance wears off as the plants mature. Therefore, thespecial seed treatment will be especially useful for plants that______________.

　　使用宽范围除草剂除去与庄稼争抢阳光，水分和营养的杂草面临一个困难：如何保留庄稼随着杂草的被杀死。对于至少一些粮食作物而言，特殊培育的能抵抗除草剂的种子正处于发展之中。这种抵抗会消失随着植物生长成熟。因此，这种特殊的种子培育将会特别有用对于那些植物，这些植物____________。

　　(A) producetheir crop over an extended period of time, as summer squash does

　　产生收成在一个广大的时间期间，就像summer squash

　　(B) producelarge seeds that are easy to treat individually, as corn and beans do

　　产生大种子能够容易地个别对待，就像玉米和豆子

　　(C) provide,as they approach maturity, shade dense enough to keep weeds from growing

　　提供，随着它们接近成熟，遮蔽足够的阴凉来抑制杂草生长

　　(D) aretypically grown in large tracts devoted to a single crop

　　被通常种植在大片一种单一作物的土地上

　　(E) arecultivated specifically for the seed they produce rather than for their leavesor roots

　　被特别地为了种子而种植而不是为了它们的叶子或者根茎