Which of the Following Forms the Most Stable Anion in the Gas

Multiple Choice

Which of the following forms the most stable anion in the gas phase?

A) Cl (electron affinity = -349 kJ/mol)
B) S (electron affinity = -200 kJ/mol)
C) O (electron affinity = -141 kJ/mol)
D) C (electron affinity = -122 kJ/mol)
E) P (electron affinity = -72 kJ/mol)