Which statement best explains why objects are pulled towards earth's center

I didn't see any statement. But here is the --

Explanation:

But objects are pulled towards earth's center by gravity. classical mechanics can not define the gravity but general relativity describe it as a curve of space-time by a concentrated energy or mass. As the mass of an object increases the more space time will be curved in the direction of positive energy so the center of the earth is the minimum point of the curved space-time by earth.That's why smaller objects than earth will fall to the center of the    earth.

none, its a machine

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right