Near Sea Level, the Atmosphere Is Composed of 78% Nitrogen

Near sea level, the atmosphere is composed of 78% nitrogen and 20% oxygen. Other trace gases make up the remaining 2%. At room temperature,

A) all the gas molecules move at the same speed.
B) the nitrogen gas molecules, on average, move faster than the oxygen molecules.
C) the nitrogen gas molecules, on average, move slower than the oxygen molecules.
D) some nitrogen gas molecules could move faster than some of the oxygen gas molecules.
E) some nitrogen gas molecules could move slower than some of the oxygen molecules.
F) B and D
G) C and D
H) B, D, and E