Mercutio thinks that Romeo is dishonorable for not fighting and so he wants to fight Tybalt. He draws his sword and directs Benvolio to draw his sword in an effort to break up the fight because the Prince banned fighting.
I would say c since he asked in the end sentence.
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"And so I leave it with all of you: Which came out of the opened door - the lady, or the tiger?"</span>