These lines are:
<em>Parting is such sweet sorrow</em><em>That I shall say good night till it be morrow.
</em>Neither Romeo nor Juliet want this night to end because they don't want to leave each other's side. They want to stay together the entire night, but given that they are unable to, Juliet speaks those famous parting words, wishing to meet Romeo again in the morning.
C is the answer. When will the winter end?
