Question

Read the following passage spoken by Juliet.

Yet I should kill thee with much cherishing.
Good-night, good-night! parting is such sweet sorrow!
That I shall say good-night till it be morrow. (II. ii. 200-202)

Of what motif is it an example, and how do you know?

Oxymoron; it does not make sense, but it is true anyway.
Oxymoron; sweet is not a word that one would typically use to describe sorrow.
Symbolism; the parting is symbolic of their ultimate deaths.
Dramatic irony; the reader already knows what is going to happen.