What statement is true concerning portable power tools?

Correct Answer: Option C — Unless the power tool is an approved double-insulated type, an ungrounded power tool has the potential to cause a fatal accident due to electrical shock.

Electrical safety standards dictate that non-double-insulated tools must be properly grounded to prevent chassis electrification during a fault. If the tool is not double-insulated, an ungrounded tool poses a lethal shock risk to the operator if an internal short circuit occurs, as the current will seek ground through the user.