(A) $C_4$ plants show saturation at $CO_2$ concentrations of about $360$ $ppm$.This is because $C_4$ plants have a more efficient mechanism for $CO_2$

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(A) $C_4$ plants show saturation at $CO_2$ concentrations of about $360$ $ppm$.This is because $C_4$ plants have a more efficient mechanism for $CO_2$ fixation (via $PEP$ carboxylase) compared to $C_3$ plants.$C_3$ plants show saturation at $450$ $ppm$ to $500$ $ppm$ of $CO_2$.