The Terms "Subspecies" and "Race" Are Best Described by Which

The terms "subspecies" and "race" are best described by which of the following scenarios?

A) a population of rabbits that lives near a lake and sometimes breeds with rabbits farther inland
B) two populations of birds that have different amounts of orange coloration and could produce offspring if they were not separated by a mountain range
C) two populations of frogs that cannot produce offspring
D) a breed of dog with a longhaired coat instead of a shorthaired coat