Ocean tides are the result of differences in the gravitational force between the sun and the Earth's near side and far side, and ditto for the moon.
Ocean tides are mainly the result of the gravitational pull from the Moon and the Sun, which creates tidal bulges in Earth's oceans. As Earth rotates, these bulges lead to the regular rise and fall of sea levels, causing two high tides and two low tides each day. Thus, the correct answer is D.
;