Correct option (c) Photorespiration
Explanation :
Photorespiration is the process which makes a different between the C3 and C4 -plants. In this process, there is a continuous loss of carbon fixed in the from of CO2.
It occurs due to the high O2 content, high temperature conditions in which RuBp carboxylase Start working as RuBP oxygenate and normal photosynthesis does not occur.