Which One of the Following Statements Is NOT Correct

Which one of the following statements is NOT correct?

A) Nucleons are held together in a nuclide by the electromagnetic force.
B) Oxygen-15 is unstable because it has too few neutrons.
C) All nuclides with Z > 83 decay into more stable nuclides with smaller Z values.
D) As the atomic number increases,the ratio of neutrons to protons in a nuclide increases.
E) Generally the number of neutrons in a nuclide equals the number of protons,or nearly so,when the atomic number is small,i.e.,Z < 18.