Why Was It Important That Darwin Visited Islands, and Then

Why was it important that Darwin visited islands, and then compared island species with continental species?

A) Because Darwin found unique species on the islands. These island species did not have any of the . characteristics of their ancestral continental species.
B) Because Darwin's attention was drawn to the uniqueness of the island species, even though they . retained some resemblance to continental species.
C) Because Darwin's attention was drawn to the uniqueness and variety of finches on the islands, determining that their adaptations came from eating different food than continental species.
D) Because Darwin saw very low reproductive survival rates on the island as compared to the mainland.
E) Because Darwin observed continental species of finch flying to the islands.