What Was One of the Observations Darwin Made in the Galapagos

What was one of the observations Darwin made in the Galapagos Islands?

A) Species on the island shared similarities to species on the adjacent mainland but with some distinct differences.
B) Species on the island did not have counterparts on the adjacent mainland as if they were separately created.
C) Species on the island were identical to species on the adjacent mainland but much smaller.
D) There were no differences between species on the island and species on the adjacent mainland.
E) All of the above statements are correct.