On small passenger vessels, fuel lines may be made of __________.

Correct Answer: Option A — annealed tubing of copper, nickel-copper, or copper nickel

46 CFR 182.440 specifies that fuel lines on small passenger vessels must be constructed of annealed tubing made of copper, nickel-copper, or copper-nickel. These materials are chosen for their resistance to vibration-induced fatigue and corrosion, ensuring the integrity of the fuel system in a marine environment.