The reason the Captain describes Macbeth as brave is C. He killed the leader of the rebels.
The leader of the rebels was MacDonwald. MacDonwald was defending the Thane of Cawdor, who threatened the kingship of King Duncan of Scotland. This was the reason King Duncan crowned Macbeth the Thane of Cawdor after his victory.
In the Captain's own words, Macbeth was "Valor's Minion," or servant, and therefore, a courageous warrior.
The Captain does not describe Macbeth as brave because Macbeth
Thus, the reason the Captain describes Macbeth as brave is C.
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