If the Master of a US-flag towing vessel replaces any crew member with a non-US citizen, he/she must ensure that the ___________ .

A
replacement holds a license or document equivalent in experience and training to a mariner holding US credentials
B
replacement can communicate with other crew members to the extent required by regulations
C
vessel is on a foreign voyage, outside US jurisdiction, and not operating above the US outer continental shelf
D
all of the above
E