The Atomic Model That Includes Isotopes Differs from Dalton's View

The atomic model that includes isotopes differs from Dalton's view of the atom.Which of the following statements is false?

A) The identity of an atom can be determined solely by its atomic number.
B) The identity of an isotope can be determined solely by its mass number.
C) Atoms of different elements may have the same mass numbers.
D) Atoms of different elements cannot contain the same number of protons.
E) The different isotopes of an element are not always equally abundant.