Question

select the best evidence to support the statement that mr. armins personality is different offstage than onstage. when the music ended, there was a moment of relative silence, followed by a ripple of laughter. mr. armin, one of our best actors, was on the stage now, doing his comical turn... the audience responded, as usual, with uproarious laughter. mr. armins exit was accompanied by an explosion of applause, whistles, and cheers so enthusiastic that i looked up from my work. he came capering off the stage, wearing a broad smile that vanished the moment he was out of the audiences sight, to be replaced by an expression that, while still pleasant enough, was businesslike. \how are you progressing?\ he asked.
early done,\ i replied—not much of an exaggeration. \excellent. i knew we could depend on you.\

Explanation:

The key - evidence is that Mr. Armin had a broad smile while on - stage and in front of the audience, but the smile vanished and was replaced by a businesslike expression as soon as he was out of the audience's sight. This shows a difference in his personality offstage and onstage.

Answer:

He came capering off the stage, wearing a broad smile that vanished the moment he was out of the audience's sight, to be replaced by an expression that, while still pleasant enough, was businesslike.