单项选择题
MV SUDAN/MEAN AT 0200UTC IN POSITION 40.44N 141.52E PASSED A DERELICT ABOUT 40 TONS HALF SUBMERGED AND IS DRIFTING. This cable says that she met with possibly（）.
A.a floating wreck
B.a survivor at sea
C.a man who had fallen overboard
D.a drilling rig
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