In Your Travels Through Space, If You Were to Encounter

In your travels through space, if you were to encounter a planet that was very large but had no atmosphere, what might have happened?

A) The planet's atmosphere escaped into space because the force of gravity was too low.
B) The planet's atmosphere escaped because it was heated too hot and boiled into space.
C) The atmosphere never formed because there was not enough heat energy available.
D) Only planets with life have an atmosphere.
E) none of the above