Yes. The author is giving the ocean a human trait. It crashes.
"A. Two-thirds of the team attended practice" is the only sentence that is written correctly since in this case fractions should be hyphenated, although this is slipping from convention.
Answer:
it is race
Explanation: it is a race of difficulty's and impotant themes of novels
Quindlen links the conclusion to the introduction of her essay with the words "like many improbable ideas, when it works, it's a wonder", which is very close to her claim in the overall text, "America is an Improbable idea", it isn't supposed to work but it does despite all of the differences, specifically racial or ethnic, within it.