The primary acceptor of CO2 - in C4 -plants is

Answer: Option C

The primary acceptor of CO₂ - in C₄ -plants is PEP.
The carbon-fixation pathway begins in the mesophyll cells, where carbon dioxide is converted into bicarbonate, which is then added to the three-carbon acid phosphoenolpyruvate (PEP) by an enzyme called phosphoenolpyruvate carboxylase.
The product of this reaction is the four-carbon acid oxaloacetate, which is reduced to malate, another four-carbon acid, in one form of the C₄ pathway.