The correct answer is D) along the bottom of any bulkhead. The reasoning is that in a completely flooded compartment, the greatest pressure will be exerted along the bottom of the bulkhead. This is due to the principles of hydrostatic pressure, where the pressure at a given depth is proportional to the depth of the fluid column above that point. Since the bottom of the bulkhead is the deepest point in the flooded compartment, it will experience the highest pressure. The other options are incorrect because the pressure will not be greatest at the vertical center (A), one-third from the bottom (B), or along the top (C) of the bulkhead, as these points are at lesser depths compared to the bottom.