Why are hybrids rare in the case of sympatric evolution and character displacement?

A) Hybrids scare the nonhybrids because of their uncanny appearance, and therefore rarely mate.
B) Hybrids usually move out of the region and thereafter undergo allopatric, not sympatric, evolution.
C) Sympatrically evolving species can't mate with each other and therefore can't produce hybrids.
D) Hybrids may have reduced ability to produce offspring and may be less able to compete with nonhybrids for food or other resources.