The formation of $O^{2-}(g)$ starting from $O(g)$ is endothermic by $603\;kjmol^{-1}$ .If electron affinity of O is$-141\;kjmol^{-1}$, the second electron affinity of oxygen would be :

Question

$(a)\;+744\;kjmol^{-1} \\(b)\;-744 kjmol^{-1} \\ (c)\;+462\;kjmol^{-} \\ (d)\;-462\;kjmol^{-1}$