Which One of the Following Statements Is Not Correct? in a Sample

Which one of the following statements is not correct? In a sample of air at a given temperature ________

A) the nitrogen and oxygen molecules have the same average kinetic energy.
B) the nitrogen and oxygen molecules have the same average speed.
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.