Certain populations of finches have long been isolated on the Galapagos Islands off the western coast of South America. Compared with the larger stock population of mainland finches, these separate populations exhibit far greater variation over a wider range of species. The variation among these numerous finch species is the result of 

(A) Convergent evolution 

(B) Divergent evolution 

(C) Disruptive selection 

(D) Stabilizing selection