Answer:
A. Cations
Step-by-step explanation:
To answer this question, you first need to understand the definitions of the answers. A cation is a positively charged ion; this means it lost an electron. An anion is a negatively charged ion that has gained one or more electrons. Proton donors and acceptors don't exist because atoms do not take or give protons. If an atom's number of protons changes then the element itself changes.
Metals have low electronegativity because their number of valence electrons is low; this means they want to get rid of electrons. So, when sodium bonds with another element, it loses an electron. Since it loses an electron it gains a positive charge and becomes a cation.