কোন বিক্রিয়াটি তাপোৎপাদী?

A \( 2 N H_{3 \left ( g \right )} \rightarrow N_{2 \left ( g \right )} + 3 H_{2 \left ( g \right )} \)

B \( N_{2 \left ( g \right )} + O_{2 \left ( g \right )} \rightarrow 2 N O_{\left ( g \right )} \)

C \( N_{2 \left ( g \right )} + 3 H_{2 \left ( g \right )} → 2 N H_{3 \left ( g \right )} \)

D \( 2 S O_{3 \left ( g \right )} → 2 S O_{2 \left ( g \right )} + O_{2 \left ( g \right )} \)

Correct Answer: Option C