Which of the following reaction is endothermic?

Options

A. `CaCO_(3)(s)to CaO(s)+CO_(2)(g)`
B. `Fe(s)+S(s)to FeS(s)`
C. `NaOH(l)+HCl(l)to NaCl(l)+H_(2)O(l)`
D. `CH_(4)(g)+2O_(2)(g)to CO_(2)+2H_(2)O(l)`

Answer

A