Which figure of speech is used in this excerpt from act 1 of Shakespeare's Romeo and Juliet?
ROMEO: O, she doth teach the torches to burn bright!
It seems she hangs upon the cheek of night
Like a rich jewel in an Ethiope's ear;
Beauty too rich for use, for earth too dear!
a. oxymoron
b. allusion
c. simile
d. metaphor
e. pun