Sato and Goshima (2007) Studied Mate Preferences of Female Stone

Sato and Goshima (2007) studied mate preferences of female stone crabs (Hapalogaster dentata) in aquaria and found that the females use chemical cues rather than visual cues to make their choice between two males. They did this by

A) applying an antiaphrodisiac to one of the two males.
B) blocking the female's eyes.
C) placing the test males in opaque plastic pipes with very narrow openings in them.
D) using only small males in choice tests rather than large males.