How do the last two lines of the poem reveal the difference between the speaker's perception of Richard Cory and Richard Cory's own feelings about himself?

A) Richard Cory was happy with himself but the speaker didn't like him.
B) Richard Cory was happy with himself, but the speakers are not happy with their identities.
C) The speaker was glad that Richard Cory was as unhappy as the rest of the people in the town.
D) The speaker thought Richard Cory was happy because he had everything the speaker wanted, but Cory was actually unhappy.