Which statement best explains why objects are pulled toward Earth’s center?

a. Earth has a magnetic force that is strongest at its core.
b. Earth has a much greater mass than objects on its surface.
c. The weight of the atmosphere pushes objects toward Earth's surface.
d. The strength of the Sun’s gravity pushes down on objects at Earth's surface.

It should be option B. Earth has a much greater mass than objects on its surface.

Explanation:

Easily, it wouldn't be option D. , because the strengthen of the Sun's gravity should not have to do with gravity of the Earth. Option C. would be incorrect since the atmosphere doesn't push on us, if it did, then we would be flatten by now. The debt was between option A. and B. , the tiebreaker was the option A. is true, BUT that is what rotates the planet, and makes it orbit the Sun. So that means it should be option B. (If it's not, then I'm sorry..)