A coolant is usually used when cutting metal in a power hacksaw to prevent the __________.

Correct Answer: Option B — blade from overheating

Power hacksaws generate significant heat through friction between the blade teeth and the metal workpiece. Using a coolant dissipates this heat, preventing the blade from losing its temper or softening. Maintaining the blade's hardness is critical for preserving cutting efficiency and preventing premature blade failure during heavy-duty metal cutting operations.