HELP!

Which of the following statements in incorrect?

a. One mole of ozone, O3(g), has a mass of 48.0 g.

b. One mole of methane, CH4(g), contains 6.02 x 1023 carbon atoms.

c. 12.01 g of carbon has the same number of atoms as 12.01 g of nitrogen.

d. One mole of a substance is the amount of the substance that has the
same number of entities as 12.00 g of carbon-12.