(C) The reduction of $NaOH$ to $Na$ is a highly endothermic and difficult process because $Na$ is a very strong reducing agent. Among the given option

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(C) The reduction of $NaOH$ to $Na$ is a highly endothermic and difficult process because $Na$ is a very strong reducing agent. Among the given options,$C$ (carbon) is capable of reducing $NaOH$ to $Na$ at high temperatures. The reaction is: $2NaOH + 2C \rightarrow 2Na + 2CO + H_2$.