Answer:
Step-by-step explanation:
Alliteration is the repetition of letters or sounds.
A metaphor is a direct comparison.
A simile is a comparison using the words "like" or "as".
Theme is the main idea.
We are given the sentence:
"Fighting Grendel was like fighting the sea"
This sentence compares fighting Grendel to fighting the sea, using the word like.
Therefore, the best answer choice is C. simile.