[单选题]S1：MV Blue Whale, Captain to Mate. Is the anchor ready for letting go? S2：MV Blue Whale, Mate to Captain. Port anchor ready for letting go. The anchor is just above the water. S1：MV Blue Whale, Captain to Mate. Let go port anchor. S2：；MV Blue Whale, Mate to Captain. Let go port anchor. S1：MV Blue Whale, Captain to Mate. How is the cable leading? S2： MV Blue Whale, Mate to Captain. Cable is leading forward. Medium weight. Five shackles in water. S1：MV Blue Whale, Captain to Mate. Is she brought up? S2：MV Blue Whale，Mate to Captain. Brought up，Sir. S1：MV Blue Whale, Captain to Mate. Hoist the anchor ball before you leave. S2：MV Blue Whale, Mate to Captain. Anchor ball being hoisted, Sir. 1：What is the vessel most probably doing?( )
A. Anchoring.
B. leaving anchorage.
C. towing.
D. berthing.