单选题A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.Athree masthead lights in a vertical line instead of either the forward or after masthead lightBtwo masthead lights in a vertical line instead of either the forward or after masthead lightsCtwo towing lights in a vertical line at the sternDa small white light aft of the funnel
单选题
A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
A
three masthead lights in a vertical line instead of either the forward or after masthead light
B
two masthead lights in a vertical line instead of either the forward or after masthead lights
C
two towing lights in a vertical line at the stern
D
a small white light aft of the funnel
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