Two Populations of Organisms Belong to the Same Biological Species

Two populations of organisms belong to the same biological species when they

A) cannot mate with each other because mating occurs at different times.
B) use different types of behaviors or physical features to attract mates.
C) have anatomical features that make it difficult for organisms from the two populations to mate with one another.
D) encounter each other, mate, and produce viable, fertile offspring under natural conditions.