What is correct with respect to required watertight bulkheads on small passenger vessels less than 100 GT?

Correct Answer: Option A — Sluice valves are not permitted.

46 CFR 179.310 prohibits the use of sluice valves in watertight bulkheads on small passenger vessels. These valves are considered a major safety hazard because they allow uncontrolled water transfer between compartments, which could lead to rapid loss of stability and potential capsize during a flooding casualty.