The correct option is B Transpiration
Carbon-cycle is a process in which the carbon is circulated, transformed between living things and the environment. The burning of fossil fuels and respiration expels carbon dioxide in the environment which is fixed by the process of photosynthesis.
Transpiration is a process in which the moisture is carried from roots to the leaves and then evaporation occurs from the pores present on the underside of the leaves. Therefore, the correct answer is option B.