What precautions should be followed when using a chisel having a mushroomed head?

Correct Answer: Option A — Remove the ragged edges by grinding.

Mushroomed heads on chisels are a significant safety hazard, as they can shatter upon impact. Grinding the head to remove ragged edges restores the tool to a safe, functional state, preventing metal shards from flying and causing injury, which is a fundamental requirement of shipboard safety management systems.