If a tire is on fire, you should use:

Large amounts of water.. Section 2.21: Burning tires are hard to put out. Use large amounts of water if available.

If a tire is on fire, you should use:

ANSWER BREAKDOWN
  • A. Incorrect. "Only a CO2 extinguisher." is not correct. Burning tires are hard to put out. Use large amounts of water if available.
  • B. Correct. Burning tires are hard to put out. Use large amounts of water if available.
  • C. Incorrect. "Dirt only." is not correct. Burning tires are hard to put out. Use large amounts of water if available.
  • D. Incorrect. "Gasoline." is not correct. Burning tires are hard to put out. Use large amounts of water if available.