The size of the fire hydrant hose connections must be either 1 1/2 inches or __________.

Correct Answer: Option B — 2 1/2 inches

Standardized fire main hose connections are mandated by 46 CFR to ensure interoperability of firefighting equipment. Fire hydrants must be fitted with connections sized at either 1 1/2 inches or 2 1/2 inches to accommodate standard shipboard fire hoses and nozzles, facilitating effective response during emergency fire suppression operations.