To solve this problem, we need to analyze the given statements:$\newline \bullet$Statement I: The primary CO2 acceptor in C4 plants is phosphoenolpyruvate and is found in the mesophyll cells.$\newline$ - In C4 plants, the initial fixation of CO2 occurs in the mesophyll cells.$\newline$ - Phosphoenolpyruvate (PEP) acts as the primary CO2 acceptor, forming oxaloacetate.$\newline$ - This process is characteristic of C4 photosynthesis, which helps in reducing photorespiration.$\newline$ - Therefore, Statement I is correct.$\newline \bullet$