Answer:
B. Wilson's marriage and Gatsby's dream
Explanation:
Tom's mistress was Wilson's wife Myrtle, so it's safe to say that Tom "smashed" Wilson's marriage.
Daisy was torn between Gatsby and Tom, and Gatsby's dream had always been to woo her. When she proved less receptive, he ended up dead in the pool. So it's safe to say that Daisy "smashed" Gatsby's dream.
D. look up the unfamiliar word in a dictionary to check its meaning.
Context clues will always provide hints with regard to helping readers figure out what a word or term means. However, after figuring out what a word means based upon context clues (which should only be considered the first step), what you should do is look up the word in question. This should be done so you could check your interpretation as well as help you commit the new word or term to memory.