The Figure Below Shows That the Cohabitating Ground Finches on Pinta

The figure below shows that the cohabitating ground finches on Pinta Island (topmost graph) experienced character displacement, with birds specializing in either smaller seeds or larger seeds.
Predict the outcome of this cohabitation if large and small seeds had not been initially available.

A) The two species would have been in direct competition and one would become extinct on the island.
B) It would proceed exactly as illustrated except that the range of beak sizes would be less varied.
C) Coevolution would have caused the native plants to produce the necessary variety of seed sizes.
D) The less competitive species would have shifted its feeding preference to insects.