Where Did Earth's Atmosphere Originate

Multiple Choice

Where did Earth's atmosphere originate?

A) Earth's gravity trapped gases from passing comets.
B) Gases were released from Earth itself as it cooled.
C) Earth's gravity trapped gases from Earth itself.
D) Earth's gravity trapped gases from passing comets, gases were released from the Earth itself as it cooled, and Earth's gravity trapped gases from the Earth itself.
E) Gases were released from Earth itself as it cooled Earth's gravity trapped gases from the Earth itself.