SC- New England agriculture

kareem.firoz wrote: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 - Not parallel
B
basing a marketing and distribution system on the imported produce of Florida and California - Not parallel

C
basing a system of marketing and distribution on the import of produce from Florida and California - Not parallel

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

kareem.firoz wrote:OA = D

I went for B with half mind since i thought 'basing a system' is parallel to 'cost of land' and 'pressure of housing and commercial development'.

I would have been happier had there been an option 'the basing of a marketing and distribution system on importing produce from Florida and California'
What am I missing?