You are presented with the question "What causes the amount of attraction exerted by an object?" and the following answer choices: 
- mass
 - motion
 - motors
 - heat
 - energy
 - wind
 - fibers
 - fields

Now knowing that the mass of an object causes the gravitational force exerted by that object and gravitation is a universal force of attraction acting between all matter, choose the best answer.


 

 mass        