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At a certain temperature, the reaction between \( \mathrm{NO} \) and \( \mathrm{O}_{2} \) to form \( \mathrm{NO}_{2} \) is fast, while that between \( \mathrm{CO} \) and \( \mathrm{O}_{2} \) is slow. It may be concluded that
(a) \( \mathrm{NO} \) is more reactive than \( \mathrm{CO} \).
(b) \( \mathrm{CO} \) is smaller in size than NO.
(c) activation energy for the reaction \( 2 \mathrm{NO}+\mathrm{O}_{2} \rightarrow \) \( 2 \mathrm{NO}_{2} \) is less.
(d) activation energy for the reaction \( 2 \mathrm{NO}+\mathrm{O}_{2} \rightarrow \) \( 2 \mathrm{NO}_{2} \) is high.
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