Finches speciated in the Galápagos Islands because

A、 the Galápagos Islands are not far from the mainland.
B、 the Galápagos Islands are arid.
C、 the Galápagos Islands are small.
D、 the islands of the Galápagos archipelago are sufficiently isolated from one Another that there is little migration among them.
E、 the islands of the Galápagos archipelago are close enough to one another That there is considerable migration among them.