C, because "butterfly chaser" seems to point to his opinions on nature.
Before we jump into our analysis, let's take a minute to review that oft-quoted last line, which is delivered by the story's narrator, Nick Carraway. The last line of Gatsby reads: “So we beat on, boats against the current, borne back ceaselessly into the past.”
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Well, it doesn't show your italics, but if I had to guess, if say A. Hope this helps
Cloven, coven, ocean, covin, hoven.