Question

the centripetal fore that keeps the earth in its orbit around the sun is provided
A. by inertia
B. by the earth's rotation on its axis
C. partly by the gravitational pull of the moon
D. entirely by the gravitational pull of the sun
E. partly by gravitational pull of the sun

Answer 1

I think entirely by the gravitational pull of the sun as the contribution from other celestial bodies is negligible and the earth-moon system is closed.