A breed of finches are born with a variety of beak sizes. The birds with smaller beaks can eat smaller seeds. The finches with larger beaks can eat larger seeds. Which environmental change would best explain an increase in the number of birds born with a smaller beaks? A.
Drought causes the trees with small seeds to dry up and stop producing seeds

B.
Drought causes the trees with large seeds to dry up and stop producing seeds

C.
More rainfall rots the bushes that have the small seeds killing the bushes.

D.
More rainfall causes the bushes with large seeds to produce more seed.