The correct option is C Stomatal
Transpiration is the process of loss of excess water in the form of water vapour from aerial parts of plants, especially from leaves but also from stems and flowers. Leaf surfaces are dotted with openings which are collectively called stomata, and in most plants, they are more numerous on the undersides of the foliage helps in the transpiration. Such type of transpiration is called as stomatal transpiration. It constitutes about 50-97% of the total transpiration. It occurs through the stomata. Thus, the correct answer is option A.