Final answer:
A Class C fire is defined as a fire that involves electrical equipment, making A. Fire in an electrical panel the correct answer.
Step-by-step explanation:
A Class C fire involves electrical equipment or installations that can become energized. In such fires, the use of water can create a hazard due to the potential for electric shock. The correct answer to which of the following constitutes a Class C fire is A. Fire in an electrical panel. Fires in fuel tanks, lumber piles, coal bunkers, or piles of paper are typically classified differently. A fire in a fuel tank would likely be considered a Class B fire, which is related to flammable liquids or gases. Fires in lumber piles, coal bunkers and piles of paper would generally fall under Class A fires, as they involve ordinary combustible materials like wood and paper.