The gravitational force causes

(A) Tides

(B) None of them

(C) Motion of moon

(D) Both (a) and (c)

The Moon revolves around the Earth in an orbit that is roughly circular, but actually elliptical. Whenever a body moves in a circular path, a centripetal force is required to keep it in motion. In the case of the Moon, this centripetal force is provided by the gravitational pull of the Earth, which makes option C correct.

Additionally, the Moon’s gravitational force affects the Earth’s oceans, creating tides and influencing ocean currents. The tidal force from the Moon causes the rise and fall of sea levels, so option A is also correct.

Hence, the correct answer is option D.