Him.
If you don't know how to solve this, you can put each word in to the blank and see which sounds right.
.he stretched out his arms toward the dark water in a curious way, and, far as I was from him, I could have sworn he was trembling. Involuntarily I glanced seaward — and distinguished nothing except a single green light, minute and far away, that might have been the end of a dock. When I looked once more for Gatsby he had vanished, and I was alone again in the unquiet darkness.
Sand water blue sky towels idk
i would say C as the correct answer. i hope its right.