A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the __________.

Correct Answer: Option B — north side of the mark

Under the IALA Cardinal System, a North Cardinal mark is identified by a continuous quick-flashing white light. This mark indicates that the safest water is located to the north of the buoy. Mariners should pass to the north of the mark to remain in the deepest, safest water.