A)"The stock market crash of 1929"
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.
I believe it is C because a quote is material from a source