Allied Naval Control of Shipping (NCS) has been established. Which statement is TRUE?

A
The Naval Control of Shipping Organization of each nation will serve their own ships only.
B
Allied ships which are at sea when an emergency is declared will all be controlled by a central authority.
C
The conduct of U.S. flag ships in an allied port will be controlled by U.S. NCS authorities.
D
After Naval Control of Shipping has neen established permission to sail must come from local naval authorities or consular officers.
E