which of the following describes allopatric speciation?

A) a tetroploid plant species evolves from a diploid ancestor. Both the tetroid and diploid species are found in the same habitat
B) a population of squirrels by the Grand Canyon. The two subpopulations evolved into two distinct species
C) a male horse and a female donkey mate, producing a sterile hinny
D) one population breads in the fall; another population breads in the spring