<span>B. to provide evidence that the age of discovery is concluding</span>
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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C.
Because when there is a crime scene fingerprints might be more important than a shoe.
