Which of the Following Statements About Isotopes Is False

Which of the following statements about isotopes is false?

A) Isotopes are atoms with same number of protons but different numbers of neutrons.
B) Most elements naturally have more than one isotope.
C) Isotopes are atoms with the same atomic number but different mass numbers.
D) An isotope with more neutrons will have a greater mass than an isotope with fewer neutrons.
E) All of the above are true.