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You are downbound on the Ohio River locking through Greenup. The chamber has been emptied and the lower gates are open. You hear one short blast of the whistle from the lock. You should __________.
A) hold up until another tow enters the adjacent lock
B) hold in the lock chamber due to a malfunction with the gate
C) tie off to the guide wall until the river is clear of traffic
D) leave the lock
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