Which Species Is Least Likely to Become Extinct

Which species is least likely to become extinct?

A) a fish species found in all five of the Great Lakes
B) a fish species that feeds on only rare snails found in only one small river
C) a mammal species that can live equally well on dry land and in fresh water
D) a fish species that has hybridized with another species to produce infertile offspring
E) a mammal species that feeds on a rare tropical orchid