For which one of the following reaction, the graph of `DeltaG` against T is almost horizontal to temperature axis
A. `C_((s))+O_(2(g)) to CO_(2)(g)`
B. `2C_((s))+O_(2(g)) to 2CO(g)`
C. `2CO_((s))+O_(2(g)) to 2CO_(2)(g)`
D. `2Mg_((s))+O_(2(g)) to 2MgO(g)`