How Do the Nuclei of the Carbon Ions C III

Multiple Choice

How do the nuclei of the carbon ions C III and C IV differ from each other?

A) The nuclei of the carbon ions C III and C IV have the same number of neutrons but a different number of protons.
B) The nuclei of the carbon ions C III and C IV have different numbers of both protons and neutrons.
C) The nuclei of the carbon ions C III and C IV are identical.
D) The nuclei of the carbon ions C III and C IV have the same number of protons but a different number of neutrons.