Why Are Species Living on Islands More Likely to Go

Why are species living on islands more likely to go extinct than those living on the mainland?

A) Islands are more fragile habitats.
B) Island populations are often very small to start with, and then resources are limited.
C) People like to live on islands, so they often take over essential habitat.
D) Predators can easily take over on an island.
E) New individuals rarely migrate to islands.