BOTH INTERNATIONAL & INLAND In DIAGRAM 5, vessel "A", which is pushing ahead, and vessel "B" are crossing. Which is the stand-on vessel?

A
Vessel "A" is the stand-on vessel because she is to port of vessel "B".
B
Vessel "A" is the stand-on vessel because she is pushing ahead.
C
Vessel "B" is the stand-on vessel because she is to starboard of vessel "A".
D
Neither vessel is the stand-on vessel in this situation.
E