Biologists disagree about the mechanism involved in the
evolution of the long neck in the giraffe. Some biologists argue
that the neck evolved through natural selection, whereas other
biologists argue that it evolved through sexual selection. Which of
the following observations would provide evidence in support of
sexual selection as the mechanism?

A. Giraffes with long necks can see farther during the dry
season, enabling them to locate water better than giraffes with
short necks.

B. Giraffes with longer necks reach more leaves, and the extra
food allows them to have more offspring.

C. Male giraffes fight with each other for access to females.
Males with long necks more often win the fights.

D. Giraffes swing their heads to fight off predators. Longer
necks allow the giraffes to fight off predators better.