Which Factor Did Not Contribute to the Genetic Diversification of the Galápagos

Multiple Choice

Which factor did not contribute to the genetic diversification of the Galápagos Island finches studied by Darwin?

A) Environmental conditions vary among the different islands.
B) Most of the islands are sufficiently distant from one another such that movement among their populations is limited.
C) The islands are only 100 km from Ecuador,so they receive a continual input of new genes from the mainland.
D) Occasional migrants to new islands rarely interbreed with endemic species.
E) Over time,the residents of each island have developed their own genetic distinctiveness.