what does this mean

When evening slippered over like the moth's brown wing.

A.the night was warm and cozy like a foot wearing a slipper

B.the night sky was very dark without any stars

C.the night was flying by very quickly

D.the night fell softly with barely a notice

Verified Answer :

CThe night was flying by very quickly.

Moths wings flutter very quickly, therefore when the night is compared to a fluttering moth wing, the author is saying the night was flying by very fast.

Here is the answer!
D. The night fell softly with barely a notice.