单项选择题
Five or more short blasts on a vessel’s whistle indicates that she is（）.
A.in doubt that another vessel is taking sufficient action to avoid a collision
B.altering course to starboard
C.altering course to port
D.the stand-on vessel and will maintain course and speed
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A.SOS three times
B.Additional transmissions to aid direction finding
C.E for one minute，followed by T for one minute
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