In which of the following process maximum energy is released

O-g→O-2g .. endothermicS-g→S-2g…. endothermicSulphur has optimum size of all the 16th group elements and has the highest electron gain enthalpy;Oxygen due to its small size and presence of lone pairs has lesser affinity towards electrons. thus its  electron gain enthalpy is abnornally low in fact least in the group.Thus ∆Heg of  S>Se>Te > Po>O.