Molecules with bonds between their components will (fall apart) in water, releasing charged particles called ions.

Molecules with ionic bonds between their components will dissociate (fall apart) in water, releasing charged particles called ions.
When the number of protons and electrons are not equal, ion is formed. There are two types of ions, Cations and anions. Cations are the positively charged ions and when an atom gains electron, Cation is formed. Anions are negatively charged ions and when an atom loses electrons, anion is formed.

the answer is option a.