(A) In $C_4$ plants,the primary $CO_2$ acceptor is phosphoenolpyruvate $(PEP)$,which combines with $CO_2$ in the presence of $PEP$ carboxylase to form

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(A) In $C_4$ plants,the primary $CO_2$ acceptor is phosphoenolpyruvate $(PEP)$,which combines with $CO_2$ in the presence of $PEP$ carboxylase to form a $4$-carbon compound called Oxaloacetic acid $(OAA)$.This $OAA$ is the first stable product formed during the $C_4$ photosynthetic pathway.