One Mole Is Defined as ________

One mole is defined as ________

A) the number of particles equal to the number of atoms in exactly 12 g of carbon-12.
B) the number of particles equal to the number of atoms in exactly 16 g of oxygen-16.
C) exactly 6.02 10²² particles.
D) the number of particles equal to the number of atoms in exactly 1 g of hydrogen-1.
E) the number of particles equal to the number of atoms in exactly 1 kg of carbon in a vault at the National Bureau of Standards.