3. The birds shown below live on a single island. These four bird species are closely related, and all of them share a common ancestor with a single species. What
environmental factor is most likely to have caused this diversity of species?
A. When the ancestral species arrived at the island, there was only one food source, so the
ancestral species left the island immediately.
B. When the ancestral species arrived at the island, there was only one food source available and
no need for different beak shapes.
C. When the ancestral species arrived at the island, there were multiple food sources available,
and different beak shapes evolved for the most efficient eating.
D. When the ancestral species arrived at the island, there were multiple food sources available,
and the different beak shapes were equally efficient for eating different food sources,