Which of the following reactions are exothermic?

I.     ${{\text{C}}{{\text{H}}_{\text{4}}} + {\text{2}}{{\text{O}}_{\text{2}}} \to {\text{C}}{{\text{O}}_{\text{2}}} + {\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}}$

II.    ${{\text{NaOH}} + {\text{HCl}} \to {\text{NaCl}} + {{\text{H}}_2}{\text{O}}}$

III.     ${{\text{B}}{{\text{r}}_2} \to 2{\text{Br}}}$

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

A