A tanker loads at a terminal within the tropical zone.She will enter the summer zone 6 days after departing the loading port.She will burn off about 45 tons/day and daily water consumption is 8 tons.How many tons may she load over that allowed by her？

A tanker loads at a terminal within the tropical zone.She will enter the summer zone 6 days after departing the loading port.She will burn off about 45 tons/day and daily water consumption is 8 tons.How many tons may she load over that allowed by her？
A.270
B.278
C.291
D.318
正确答案：318