Answer the following question given this paragraph: 

All objects in the universe have an attraction to each other. This attraction is known as gravity ( Figure below ). The strength of the force of gravity depends on two things. One is the mass of the objects. The other is the distance between the objects. As an object's mass increases, the attraction increases. As the distance between the objects increases, the attraction decreases.


Q: The attraction between all objects in the universe is known as ______.

 Choices:

- variation

- electricity

- magnetism

- gravity

A:
gravity
