What Statement Is False Regarding the Differences Between a Biological

What statement is false regarding the differences between a biological species and subspecies?

A) Crosses between biological species cannot produce fertile offspring, crosses between subspecies can produce fertile offspring.
B) Subspecies are "races" within a single species.
C) Gene flow exists among different subspecies but not among species.
D) Greater degrees of allelic frequencies exist between species than among subspecies.
E) Phenotypes of different species are easily recognizable; little to no phenotypic variation exists among subspecies.