Electron affinity is the energy accompanying the addition of an electron to a gaseous atom. Hence, option C is correct.
Electron affinity, in chemistry, is the amount of energy liberated when an electron is added to a neutral atom to form a negatively charged ion.
Electron affinity is defined as the change in energy (in kJ/mole) of a neutral atom (in the gaseous phase) when an electron is added to the atom to form a negative ion.
In other words, the neutral atom's likelihood of gaining an electron.
Hence, option C is correct.
Learn more about the electron affinity here:
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