The correct option is B veins
A leaf consists of lamina/leaf blade, midrib, veins and petiole.
The veins help in transport of water and food to different regions of the leaf. The veins along with the midrib also provide mechanical support to the leaf.
The lamina is the broad portion of the leaf which helps is capturing sunlight for photosynthesis.
The petiole is a stalk like structure which connects the lamina to the stem or branch.
Stomata are small pores present on the leaves which help in loss of water from plants in the form of water vapour.