问题：

[单选] If you are the Master of a towing vessel whose only working radar no longer functions，what must you do?（）

A . Notify the Captain of the Port (COTP) if you cannot repair it within 96 hours
B . Notify the Officer in Charge of Marine Inspection (OCMI) if you cannot repair it within 48 hours
C . Moor the vessel until it is repaired
D . Anchor the vessel until it is repaired