The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.

A.North
B.South
C.East
D.West

A.stem the current and make very slow headway when the anchor is dropped
B.stem the current and be falling aft very slowly when the anchor is dropped
C.stem the current and endeavor to make neither headway nor sternway when the anchor is dropped
D.stop all headway through the water and keep the current astern when the anchor is dropped