The correct answer is C. Convectors draw in relatively cool air through an opening at the bottom and discharge relatively warm air through an outlet grille at the top, and they are located on bulkheads near the deck. This is because the warm air rises from the convector, creating a natural circulation of air that helps heat the space. The placement of the convector near the deck allows the warm air to rise and distribute heat throughout the room. The other options are incorrect because they describe the opposite airflow pattern (cool air entering from the top and warm air exiting at the bottom) or an incorrect placement of the convector (near the overhead instead of the deck).