The answer C correctly uses possessive form and is the right answer. It's not A because there is only one George so the apostrophe is in the wrong place. In B, there's not even an apostrophe and it's not clear as to whether there is only one cousin or two or more cousins. In answer D, here should not be an apostrophe for develops.
Answer:
Although a whale's heart can be as big as a car, it beats only nine times per minute.
Answer:
It adds a specific detail about place that is relevant to the text’s topic
Explanation:
