"Bart Senior" wrote in message ...
INLAND

On the Western rivers, a vessel crossing a river must

A. only keep out of the way of a power driven vessel
descending the river
B. keep out of the way of any vessel descending the river
C. keep out of the way of power-driven vessel ascending
or descending the river
D. keep out of the way of any vessel ascending or descending
the river.

C. is correct.