The correct answer is D. sat unmoving.
The phrase “let the grass grow under his feet” means to procrastinate or to waste time. This is because grass grows slowly, so if someone lets it grow under their feet, they are not doing anything to prevent it from growing. This can be a metaphor for someone who is not taking action on something that they need to do.
The other options are incorrect because they do not convey the meaning of procrastination or wasting time. Option A, “moved away,” means to leave a place. Option B, “loitered around,” means to hang around aimlessly. Option C, “stayed out,” means to remain outside.
In conclusion, the correct answer is D. sat unmoving.