At the establishment of Naval Control of Shipping (NCS), ships at sea will __________.

Correct Answer: Option D — continue voyages unless in danger areas defined in the advisory or supplemental message

Upon the activation of Naval Control of Shipping, merchant vessels are instructed to maintain their current voyages unless specific danger areas are identified in advisory messages. This ensures the continuity of global logistics while allowing the military to provide necessary guidance regarding threats or restricted zones to ensure vessel safety.