An example of postzygotic hybrid sterility is a. the birth of a sterile mule for the mating of a horse and a donkey. b. the elaborate mating ritual of many bird species that them pick a fertile mate.

A

Explanation:

This is a type of reproductive isolation that prevents interspecies reproduction. There are two types of reproductive isolation; prezygotic and postzygotic isolation.  Choice B is a type of prezygotic that prevents fertilization, through behavior isolation, while postzygotic offers a sterile offspring that will not have offspring.