Electron Affinity Is the Energy Change That Occurs _______

Electron affinity is the energy change that occurs _______.

A) when one mole of electrons is added to one mole of gas-phase atoms or ions.
B) when a gas-phase atom or ion in its ground state gains an electron.
C) when one mole of electrons is added to one mole of atoms in their most stable state.
D) when an electron experiences the pull of the nucleus.
E) when an atom attracts an electron on another atom to form a chemical bond.