Answer:
The three parts of the given excerpt from "Dover Beach" by Matthew Arnold that the speaker describe the sorrow and confusion that he wants to escape are:
1. But now I only hear its melancholy, long, withdrawing roar,
2. Hath really neither joy, nor love, nor light
3. And we are here as on a darkling plain
It was an additional act of revenge.
Well,if you don't follow instructions you might make a mistake and mess up what you were supposed to do.Its making a cake,if you don't follow the instructions you could make the cake wrong and it would either not taste as good or it wouldn't come out like it should've.
A Is The Answer. I Am Sure.