One valid assumption of the kinetic theory of gasses is the

A.

the molecules of a gas are constantly in a state of motion and the number of collision remains constant

B.

the number of molecule of gas increases with increasing pressure

C.

as the temperature increases, the number of collision made by the gas molecule remains constant

D.

the molecules of gas are all identical and are very small in size

Correct answer is D

No explanation has been provided for this answer.