For the reaction between $CO_2$ and graphite $CO_2(g) + C(s) \longrightarrow 2CO(g)$ $\Delta H = +170.0 kJ$ and $\Delta S = 170 JK^{-1}$. The reaction is spontaneous at

Question

(a) 298 K
(b) 500 K
(c) 900 K
(d) 1200 K