The correct option is C guttation
Stomata are the tiny porous structures present in the leaves which are guarded by the guard cells. The opening and closing of the guard cells regulate the opening and closing of the stomata. Carbon dioxide and oxygen is exchanged through the stomata. During the process of transpiration, water is lost as water vapour through the stomata. Guttation is the process of loss of water in liquid form through the hydathodes.