Which line in this excerpt from act iv of shakespeare's romeo and juliet best reveals the dramatic irony of the scene?
nurse: mistress! what, mistress! juliet! fast, i warrant her, she:
why, lamb! why, lady! fie, you slug-a-bed!
why, love, i say! madam! sweet-heart! why, bride!
what, not a word? you take your pennyworths now;
sleep for a week; for the next night, i warrant,
the county paris hath set up his rest,
that you shall rest but little. god forgive me,
marry, and amen, how sound is she asleep!
i must needs wake her. madam, madam, madam!
ay, let the county take you in your bed;
he'll fright you up, i' faith. will it not be?

(undraws the curtains)

what, dress'd! and in your clothes! and down again!
i must needs wake you; lady! lady! lady!
alas, alas! , ! my lady's dead!
o, well-a-day, that ever i was born!
some aqua vitae, ho! my lord! my lady!