Choose the reaction, for which the standard enthalpy of reaction is equal to the standard enthalpy of formation:

Options

A. `2H_(2) (g) + O_(2) (g) to 2H_(2) O(l)`
B. `2C(g) + 3H_(2) (g) to C_(2) H_(6) (g)`
C. `(3)/(2) O_(2) (g) to O_(3) (g)`
D. `(1)/(8) S_(8) (s) + O_(2) (g) to SO_(2) (g)`