The best means of combating an oil fire on the surface of the water surrounding a vessel tied to the pier is to use __________.

Correct Answer: Option A — foam directed against the vessel's side

Foam creates a vapor-tight blanket that suppresses flammable vapors and prevents oxygen from reaching the fuel. Directing foam against the vessel's side allows it to flow gently onto the water surface, ensuring the blanket remains intact and effectively smothers the fire without splashing or spreading the burning oil.