一道语法题求助-->Zeros转移

ketchum

Many birds have feathers ______ with their surroundings.
A. colors blend
B. that colors to blend
C. whose colors blend
D. of which the colors that blend

正确答案是C， 我想问问其他答案哪里错了。谢谢！

gre3333

a：定语从句没有引导词。

b：定语从句没有谓语。

d：that多余