Correct Option: A

C₄ plants are specialised plants for better CO₂ assimilation found in hot environment.They have a characteristic leaf anatomy called kranz anatomy showing two distinct choloroplast containing cells mesophyll and bundle sheath cells. Mesophyll cells are located very near to bundle sheath cells and are the site for C₄ cycle i.e. CO₂ is first fixed as a 4 carbon compound oxalocetic acid by the action of PEP carboxylase. The second carboxylation event occurs in stroma of chloroplast of bundle sheath cell through C₃ cycle.