[romeo and juliet]
to what does the following allusion refer?

romeo. let me be ta'en, let me be put to death;
i am content, so thou wilt have it so.
i'll say you grey is not the morning's eye,
'tis but the pale reflex of cynthia's brow;

a. diana (the moon)

b. juliet's mother

c. nurse

d. apollo's chariot