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Once he cut it off, he could use it as a weapon because it's powers still worked, so if someone attacked him he could just whip it out and use it as a weapon to turn his enemies to stone, which he does on few occasions and wins the fights that would either be impossible or much harder for him.
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The answer is C.
A is not, because the cowboy's appearance is not relevant to his personality as a round character. Same general idea for B and D.
Option A.A character following her dreams.