You are presented with the question "What causes gravity on the Earth?" and the following answer choices: 
- the Sun
 - friction
 - heat
 - Movement
 - wind
 - ligt
 - quadriceps
 - mines

Now knowing that the mass of an object causes the gravitational force exerted by that object and gravity is the force that keeps the earth in orbit about our sun, choose the best answer.


 

 the Sun        