This question seems to already be answered all in itself but,
He compares his love to the sea because he believes it is infinite, however the sea can also be a place that no one wants to tread on since it can be dangerous. Hence, comparing his love to Juliet being a dangerous and treacherous journey all in itself due to the difference of being capulet and montague.
Answer:
A. a
B. the, no article
C. an
D. no article, an
E. no article, the
Explanation:
Hope this will help you. If any answer is incorrect please forgive me.