Observe the characteristic facial features of the Galapagos Island finches below:

- The vegetarian finch eats fruit and seeds.
- The cactus finch eats cactus fruits and insects inside cactus flowers.
- The small tree finch eats insects.

Which statement is most likely true about the Galapagos Island finches?

A. The different beaks are not related to the food they eat but are adaptations resulting from the length of the finch's life.

B. The different beaks are adaptations resulting from wind wearing away the outer layers.

C. The different beaks are not related to the food they eat but are adaptations resulting from the makeup they wear on their beaks.

D. The different beaks are adaptations resulting from the type of food available on the different islands.

E. The different beaks are adaptations resulting from the amount of food available on the different islands.