Answer: D. Playfulness and happiness vanish early from Grendel's world.
Explanation: In the given excerpt from "Grendel" by John Gardner, we can see the main character (Grendel) speaking about his childhood, when he says he used to play, he also says "it might as well be a thousand years ago" with this phrase he is expressing that it seems like his happy childhood was gon a thousand years ago (a long time ago) which indicates that playfulness and happiness vanish early from Grendel's world.