The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for（）.

A.The sun to be at the opposite side of the moon

B.The moon to be at the opposite side of the earth

C.The moon to be at its apogee

D.The sun and the moon to be on the same side

正确答案：The moon to be at the opposite side of the earth