Brightly Colored and Extremely Large Tails in Male Birds of Paradise

Brightly colored and extremely large tails in male birds of paradise have been selected by evolutionary processes mainly because these features:

A) Makes the animal smartest
B) Allows the animal to live the longest
C) Allows the animal to live in the widest variety of environments
D) Allows the animal to produce the largest number of viable offspring
E) Allows the animal to become the largest