[求助]大全529

1.        New hardy varieties of rice show promise of producing high yields without the costly requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties.CE

(A) requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties

(B) requirements by earlier high-yielding varieties of application of commercial fertilizer and irrigation

(C) requirements for application of commercial fertilizer and irrigation of earlier high-yielding varieties

(D) application of commercial fertilizer and irrigation that was required by earlier high-yielding varieties（E）

(E) irrigation and application of commercial fertilizer that were required by earlier high-yielding varieties

完全木有思路··请教请教。

(A) requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties....by was used incorrectively here; for should be used here but rather by

(B) requirements by earlier high-yielding varieties of application of commercial fertilizer and irrigation...same as A

(C) requirements for application of commercial fertilizer and irrigation of earlier high-yielding varieties..."of" should be used,  "requirements of "

(D) application of commercial fertilizer and irrigation that was required by earlier high-yielding varieties... irrigation and application of commercial fetilizer, not application of both.

(E) irrigation and application of commercial fertilizer that were required by earlier high-yielding varieties...correct