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$\mathrm{C}_4$-plants are more efficient in photosynthesis than $\mathrm{C}_3$-plants due to
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lower rate of photorespiration
The $C_4$ pathway is certainly more efficient than the $C_3$ pathway in the sense of carbon fixation. In $C_3$ plants, carbon dioxide and oxygen are both present. This means that most of the ribulose-1,5-bisphosphate is carboxylated, but some of the ribulose-1,5-bisphosphate is oxygenated. This results in photorespiration. So the correct option is Lower rate of photorespiration.
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