【单选题】

You have orders to drop off a barge loaded with propylene oxide at a fleet.In doing so，you must ensure that（）.

A . All wing voids and rakes are pumped dry before tying off the barge
B . The barge is moored next to the bank where it will be protected from a possible collision
C . The barge is under the care of a watchman
D . A rake end is facing upstream to minimize the effect of current on the mooring line