单选题A vessel，which does not normally engage in towing operations，is towing a vessel in distress.She（）.Aneed not show the lights for a vessel engaged in towing，if it is impractical to do soBmay show the lights for a vessel not under commandCmust show a yellow light above the stern lightDmust show the lights for a vessel towing
单选题
A vessel，which does not normally engage in towing operations，is towing a vessel in distress.She（）.
A
need not show the lights for a vessel engaged in towing，if it is impractical to do so
B
may show the lights for a vessel not under command
C
must show a yellow light above the stern light
D
must show the lights for a vessel towing
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