Part A: Love is grander and more enduring than what it is often compared to.
Part B: "Shall I compare thee to a summer's day? / Thou art more lovely and more temperate."
I don't know how the writer is but the character in the story is most likely 15. I really like the poem. I think it about why she committed suicide. What events led up to that point and it seems her father was the main reason for it.
Hope it helped.
The second option is the best fit! :)
hope this helps! have a good day!