Question

Which of the following is true?
The Moon exerts a gravitational force on the Earth, but the Earth does not exert a gravitational force on the Moon.
The Earth and Moon both exert a gravitational force on each other.
The Earth and Moon do not exert gravitational forces.
The Earth exerts a gravitational force on the Moon, but the Moon does not exert a gravitational force on the Earth.

Answer 1

I think you're in the wrong subject.

Answer 2

HOW

Answer 3

this is physics. But I can answer it regardless.

All objects with mass exert gravitational force on each other (well, technically light is also affected, but this statement is true enough for most general purposes)