单项选择题
Which statement is TRUE concerning a towing vessel which,due to the nature of her work,is unable to keep out of the way of another vessel?()
A.By day,she shall carry a black cylinder shape
B.By day,she shall carry two black balls in a vertical line
C.By night,she would show the same lights as a vessel not under command
D.By day,she would show the same shapes as a vessel restricted in her ability to maneuver
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