In case of $C_{4}$ pathway

C O_{2}

combines with PGA

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C O_{2}

combines with PEP

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C O_{2}

first combines with RuBP

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C O_{2}

combines with RMP

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Solution

The correct option is B $C O_{2}$ combines with PEP
In $C_{4}$ plants, $C O_{2}$ combines with PEP (phosphoenolpyruvate) in the presence of the enzyme PEP carboxylase to form OAA (oxaloacetate). This is the second step in the C4 pathway.
The fixation of $C O_{2}$ by the enzyme RuBisCO into PGA (3-phosphoglycerate) happens in the first step of the $C_{3}$ pathway.
The fixation of $C O_{2}$ into RuBP is observed in the CAM pathway.

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