C4 plants have better productivity because C4 plants absorb more light. C4 plants absorb more CO2. C4 plants lack photorespiration. All of the above.

Presence of photorespiration is considered as a wasteful and energy consuming process in crop plants which ultimately leads to reduction in final yield of crops. It is estimated that during C3 photosynthesis, upto 50% of fixed carbon is lost through photorespiration. C4 plants have a mechanism to minimize photorespiration and thus they show higher productivity as compared to C3 plants. Therefore, the statement 'All of the above' is the most accurate answer because C4 plants do absorb more light and CO2, and importantly, they have a mechanism to minimize photorespiration, leading to increased productivity.