INLAND ONLY A power-driven vessel crossing a river on the Great Lakes or Western Rivers, must keep out of the way of which of the following power-driven vessels?

Correct Answer: Option D — All of the above

33 CFR 83.15(b) (Inland Rule 15) mandates that a power-driven vessel crossing a river on the Great Lakes or Western Rivers must keep out of the way of a power-driven vessel ascending or descending the river, regardless of whether that vessel is towing or not.