Answer:
D
Step-by-step explanation:
A simile uses the words 'like' or 'as' to compare one thing to another.
The Sea of Faith / Was once, too, at the full, and round the earth's shore / Lay like the folds of a girdle unfurled
This excerpt uses a simile to compare the sea of faith to an unfurled girdle.
So, the answer is D.
I hope this helps ^^
Good luck :]