According to the Law of Multiple Proportions

According to the law of multiple proportions:

A) If the same two elements form two different compounds,they do so in the same ratio.
B) It is not possible for the same two elements to form more than one compound.
C) The ratio of the masses of the elements in a compound is always the same.
D) The total mass after a chemical change is the same as before the change.
E) None of these.