【单选题】If during discharging the Captain for fear of vessel being frozen in deems it advisable to leave, he has liberty to do so. This sentence says that ________ .
A.
fearing the vessel being frozen in the Captain has liberty to discharge the cargo
B.
the vessel can stop discharging and leave the unloading port if the risk of being frozen in exists.
C.
the Captain has liberty to leave the discharging port if there is no risk of being frozen in
D.
the Captain deems it advisable to leave the discharging port