Multiple choice question.

Upward and downward movement of ocean water is known as the:

A is correct. Tide refers to the upward and downward motion of ocean water, caused by the gravitational pull of the moon.

B is incorrect. Current refers to the onward movement of the water, caused by variations in temperature and density of water.

C is incorrect. Waves are generated by the winds that blow over the seas, and carried forward by these winds