Which Statement Is True About Speciation on Island Archipelagos

Multiple Choice

Which statement is true about speciation on island archipelagos?

A) Speciation is slow because it depends on emigration from the mainland.
B) Most speciation occurs allopatrically.
C) Ecological competition may cause new species to go extinct slowing speciation.
D) Speciation by polyploidy is most common.
E) Species clusters are less common.