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A.take proper and effective action to avoid collision
B.be stopped within a distance appropriate to the prevailing circumstances and conditions
C.neither A nor B
D.both A and B

A.This reading is at the same elevation as the 6.2 ft. mark on the gage at Head of Passes
B.A vessel drawing 8 ft would be able to pass over the sill at Old River Lock
C.This reading is 6.4 feet below the Low Water Reference Plane
D.A vessel drawing 7 ft. would be able to pass through the locks at Lower Old River