单选题While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards，the lookout may be（）.Athe helmsmanBthe mate on watchCEither A or BDNeither A nor B
单选题
While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards，the lookout may be（）.
A
the helmsman
B
the mate on watch
C
Either A or B
D
Neither A nor B
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