Nature of Biology Evolution question

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Can someone please help me with this question from Nature of Biology p560.

Observations about the Galapagos Islands include:

Only one species of rat is found on these islands.

More than 13 species of finches differing in the shape and size of their bills and in their preferred diets inhabit these islands.

Land iguanas with rounded tails and unwebbed toes live on these islands.

Seaweed-eating marine iguanas (see figure 14.60) with flattened tails and webbed feet live on the rocky shores of these islands and nowhere else in the world.

Given that these observations are true, assess the statements below in terms of their likely validity. Explain your decision.

a. Rat populations do not evolve.

b. Rats probably reached the Galapagos Islands before the first finches arrived.

c. Marine iguanas could not survive anywhere else in the world.

d. Marine iguanas evolved from ancestral land iguanas.

e. At various times in the past, different species of finches migrated to the Galapagos Islands from South America until a total of more than 13 kinds had arrived.

f. Flattened tails and webbed feet developed in iguanas as a result of their trying to swim.

g. Marine iguanas and land iguanas provide an example of convergent evolution.