Sounding tubes and access openings for fuel oil tanks on cargo vessels are permitted by U.S. regulations to be located in which of the listed spaces?

Correct Answer: Option D — none of the above

Title 46 CFR strictly prohibits locating fuel oil tank sounding tubes, vents, and access openings in accommodations, crew lounges, washrooms, or other public domestic spaces to prevent hazardous vapor exposure and spill contamination.