Which trait would have most likely evolved through sexual selection?

Question

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A peacock's flamboyant plumage is an example of sexual selection as it is a trait that has evolved specifically to attract mates. Females of the species are attracted to males with the most elaborate and colorful plumage, which helps those males to successfully reproduce. The other traits listed are not necessarily related to sexual selection, but rather evolved for other survival-related reasons such as defense (razor sharp teeth), reaching food (long neck), and protection (turtle's shell).

Which Trait Would Have Most Likely Evolved Through Sexual Selection