Read the excerpt from chapter 23 of The Adventures of Huckleberry Finn.

When the place couldn't hold no more, the duke he quit tending door and went around the back way and come on to the stage and stood up before the curtain and made a little speech, and praised up this tragedy, and said it was the most thrillingest one that ever was; and so he went on a-bragging about the tragedy, and about Edmund Kean the Elder, which was to play the main principal part in it; and at last when he'd got everybody's expectations up high enough, he rolled up the curtain, and the next minute the king come a-prancing out on all fours, naked; and he was painted all over, ring-streaked-and-striped, all sorts of colors, as splendid as a rainbow. And—but never mind the rest of his outfit; it was just wild, but it was awful funny.

Which best describes the source of the humor in this excerpt?
the fact that the place was packed
the duke’s speech to the audience
the image of the king performing
the audience’s high expectations