BOTH INTERNATIONAL & INLAND Which statement is TRUE concerning risk of collision?

A
The stand-on vessel must keep out of the way of the other vessel when risk of collision exists.
B
Risk of collision always exists when two vessels pass within one mile of each other.
C
Risk of collision always exists when the compass bearing of an approaching vessel changes appreciably.
D
Risk of collision may exist when the compass bearing of an approaching vessel is changing appreciably.
E