PLEASE HELP!!!!!!!! I am giving 25 points!
What is the best paraphrase of these lines from "Stopping by Woods on a Snowy Evening"?

The woods are lovely, dark, and deep/ But I have promises to keep.

a. I would love to stay, but I have too many other responsibilities.
b. I made a promise that I would not take the road past the woods.
c. The woods are beautiful, but they are owned by someone else.
d. The woods are beautiful, but my horse is tired and hungry.