Which of the Following Statements About the Evolution of Reproductive

Which of the following statements about the evolution of reproductive isolation is false?

A) Reproductive isolation evolves at about the same rate in nearly all groups of organisms.
B) Reproductive isolation can gradually evolve in the lab, even if the researchers do not directly select for it.
C) Reproductive isolation gradually increases with increasing genetic distance.
D) Reproductive isolation is not "all-or-nothing": intermediate levels of reproductive isolation can be found.
E) All of the above are true; none is false.