Which of the following statements about Newton's theory of universal gravitation are true? Select the three correct answers.

Responses:

a) The theory applies to all objects in the universe.

b) Gravitational force increases as the distance between objects decreases.

c) The theory applies only to objects on Earth.

d) Gravitational force increases as mass of objects decreases.

e) Gravitational force increases as the mass of objects increases.

f) Gravitational force increases as the distance between objects increases.