请教一道语法题

 Among the reasons for the decline of New England agriculture in the last three decades       were the high cost of land, the pressure of housing and commercial development, and basing   a marketing and distribution system on importing produce from Florida and California.

    (A) basing a marketing and distribution system on importing produce from Florida and   California
            

    (B) basing a marketing and distribution system on the imported produce of Florida and   California

    (C) basing a system of marketing and distribution on the import of produce from Florida and        California

    (D) a marketing and distribution system based on importing produce from  Florida and        California

    (E) a marketing and distribution system importing produce from Florida and California as its base

答案是D吧，跟前面的几个原因平行，比E简接

谢谢你的回答，不过答案是E，这也正是我想问的地方。

Choices A, B, and C can be faulted for putting a verb phrase, basing…, where a noun phrase is needed to continue the list of parallel elements that begins with the high cost of land, the pressure of housing… Also, the imported produce in B suggests that the system is based on the produce itself rather than on the practice of importing produce. In C, the import of produce is unidiomatic.
                D, the best choice, presents a noun phrase (… a marketing and distribution system ) that completes the list of parallel elements and refers to the act of importing produce. E also supplies the noun phrase but states illogically that the system imports produce as its base. The question is moderately easy.

lz答案看错啦吧。。。