Following a grounding, what action should be performed prior to the use of the main engines?

Correct Answer: Option C — Shift to a high sea suction.

Shifting to a high sea suction is mandatory after grounding to prevent the main engines from drawing in silt, sand, or mud from the seabed. Using a low suction in shallow water risks clogging the cooling system, which could lead to engine overheating and a total loss of propulsion during critical maneuvering.