What provides access to tanks and voids in a ship?

The correct choice, which indicates that a manhole provides access to tanks and voids in a ship, is accurate because manholes are specifically designed openings that allow personnel to enter enclosed spaces such as tanks and voids for maintenance, inspection, and repairs.

Manholes often feature a circular or rectangular shape and are fitted with covers that can be secured, ensuring safety and preventing unauthorized access. The sizing of manholes is sufficient to allow not only access for individuals but also for the transfer of equipment and materials as needed. This feature is crucial on ships where maintaining operational integrity and safety of tanks and voids is essential.

While portholes, access panels, and inspection doors serve various functions, they do not specifically cater to the need for personnel access to large enclosed spaces like tanks and voids. Portholes are primarily designed as windows for light and ventilation, access panels are often smaller openings for servicing equipment, and inspection doors facilitate limited access for straightforward inspections rather than full entry required for tasks within tanks or voids.