Answer:
B. Wilson's marriage and Gatsby's dream
Step-by-step 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.