The values of $\Delta H$ and $\Delta S$ of a certain reaction are $-400 \text{ kJ mol}^{-1}$ and $-20 \text{ kJ mol}^{-1} \text{ K}^{-1}$ respectively. The temperature below which the reaction is spontaneous, is
- A$100 \text{ K}$
- B$20^\circ \text{ C}$
- C$20 \text{ K}$
- D$120^\circ \text{ C}$
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