]The diagram below shows the movement of water on Earth. The picture shows the oceans on the world map. Ocean water is shown flowing from east to west, from the Pacific Ocean past Australia and the Indian Ocean and around the southern tip of Africa. The ocean water then flows north along the coasts of Africa and Europe. A point in the water in the north is labeled A. The water finally turns south where the Atlantic Ocean meets the Arctic Ocean. The ocean water flows south along the coasts of North and South America. A point in the water in the south is labeled B. The water then flows from west to east, past Antarctica and Australia, before finally flowing north through the Pacific Ocean.

Which of these statements best explains why water flows from point A to point B?

The salinity at B is more than at A.
The wind velocity at B is more than at A.
The temperature at A is more than at B.
The water density at A is more than at B.