单选题

The evidence in favor of insect pollination of cycads presented in lines 2-4 would be more convincing if which of the following were also true?

A、 Only a small variety of cycad species can be successfully transplanted.
B、 Cycads can sometimes be pollinated by means other than wind or insects.
C、 Insects indigenous to regions to which cycads are transplanted sometimes feed on cycads.
D、 Winds in the areas to which cycads are usually transplanted are similar to winds in cycads' native habitats
E、 The transplantation of cycads from one region to another usually involves the accidental removal and introduction of insects as well

【正确答案】 D

【答案解析】