Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in: C3 and C4 plants, C3 plants, C4 plants, C2 plants

PEP stands for phosphoenol pyruvate. It acts as a primary acceptor in the case of C4 plants and gets converted to oxaloacetate. In C3 plants, ribulose biphosphate acts as a primary acceptor and gets converted into phosphoglycerate (PGA). C2 cycle is a photorespiratory cycle where due to the excessive oxygen concentration major site of RuBisCo is occupied by it which leads to decreased efficiency of RuBisCo to combine with carbon dioxide. So, the correct answer is option C.