The correct option is C Darwin
Darwin truly supported the fact that variations occur with time. He saw amazing variations in the pattern of the beak of finches which originated from one geographical location but radiated out to the other. Darwin's finches (also known as the Galapagos finches) are a group of about fifteen species of passerine birds. They often are classified as the subfamily Geospizinae. It is still not clear to which bird family they belong, but they are not related to the true finches. They were first collected by Charles Darwin on the Galapagos islands during the second voyage of the Beagle. All are found only on the Galapagos islands, except the Cocos finch from Cocos Island.
Therefore, the correct answer is option C.