Pretty sure it’s option #2, syllabic meter. If I get it wrong my bad!!
The answer would be... D, a young man proposes marriage to the girl of his dreams and she says yes. this will most likely create an aesthetic impact of admiration at the end of a story.
The Valley of Ashes is a monstrous junk dump. The spoiling valley speaks to the decaying American dream. Tom, Daisy, and Jordan, with their unlimited socials and shallow lives speak to how material overabundance decays their extremely souls. Their lives, similar to the valley, are empty. Over the long haul the valley gets ranker as do the lives of many characters in the novel. Narcissistic people litter the story with inane "junk", much like the valley itself.