Of the Reactions Involved in the Photodecomposition of Ozone (Shown

Of the reactions involved in the photodecomposition of ozone (shown below) ,which are exothermic? 1.O₂ (g) + hν → O (g) + O (g)
2.O (g) + O₂ (g) + M (g) → O₃ (g) + M^* (g)
3.O₃ (g) + hν → O₂ (g) + O (g)
4.O (g) + O (g) + M (g) → O₂ (g) + M^* (g)

A) 2 and 4
B) 1 and 3
C) 1, 2, and 4
D) 2 only
E) all of them