When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）

A. Icebergs may travel in a direction many degrees different from the sea ice
Both icebergs and sea ice will move in approximately the same direction and at the same speed
C. Icebergs and sea ice will move in the same direction，but at different speeds due to the sail effect of the berg
D. Icebergs and sea ice will move in the same direction，but the iceberg will move slower because of its underwater bulk