Final answer:
An anion and cation are the most likely combination of ions to bind and form molecules.
Step-by-step explanation:
The most likely combination of ions to bind and form molecules is anion and cation (option B). An anion is a negatively-charged ion, and a cation is a positively-charged ion. When these oppositely charged ions come together, they form an ionic bond, which results in the formation of a molecule. For example, sodium chloride (NaCl) is formed when a sodium cation (Na+) binds with a chloride anion (Cl-).