All school buses, taxis, and other vehicles hauling passengers for hire must carry a chemical type fire extinguisher of at least:

Vehicles such as school buses, taxis, and others that transport passengers for hire are required to maintain a fire extinguisher for safety purposes. The law mandates that the fire extinguisher must have a minimum capacity of one quart. This standard is established to ensure that these vehicles are adequately equipped to handle small fires or emergencies that might arise during their operation, protecting both the passengers and the vehicle itself.

This capacity is considered sufficient for addressing minor fire incidents without burdening the vehicle with overly heavy equipment. In contrast, the options with lesser or greater capacities do not meet the regulatory requirements set for vehicles carrying passengers for hire. A half-quart would be below the minimum standard, while larger capacities, such as two quarts or three quarts, go beyond what is required and may not be practical for the vehicle's design and weight considerations. Thus, the one-quart capacity is the correct and mandated answer.