Which of the Following Is NOT a Correct Way to Finish

Which of the following is NOT a correct way to finish the following statement? In a sample of air at a given temperature,

A) the nitrogen and oxygen molecules have the same average speed.
B) the nitrogen and oxygen molecules have the same average kinetic energy.
C) some nitrogen molecules are moving slower than some oxygen molecules.
D) some nitrogen molecules are moving faster than some oxygen molecules.
E) all the molecules are moving.