The Owners to take over and pay all fuel remaining in the Vessel's bunkers on re-delivery at current price at the port of redelivery，or at the nearest main bunkering port，if the bunker price at the port of redelivery is not available. This indicates that the Owners are to take over and pay the remaining bunkers ______.
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A.at current price at the nearest main bunkering port if it is cheaper than that at the port of redelivery
B.at current price at the nearest main bunkering port
C.at current price at the port of redelivery if it is not available to obtain the current price at the nearest main bunkering port
D.at current price at the port of redelivery if obtainable，even though the price is higher at the nearest main bunkering port
正确答案是D