Suppose That a Naval Submarine Were Lost

Suppose that a naval submarine were lost. If rescuers made the A-not-B error, where would they search?

A) At the home port from where the sub launched
B) At the high-seas location where the sub last submerged
C) At the spot where the sub is expected to emerge after a given amount of time
D) In Davy Jones's locker, where souls of lost sailors congregate