PT 13 S4 Q23

A certain species of bird has two basic varieties crested and noncrested. ... ...

Which one of the following, if true, provides the most support for the argument?
(A) Birds of other species also tend to show preferences for mates that have one or another specific physical feature.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Stronger" Questions, Set 3 - Difficult/Uncommon Mix (25Q)