The correct option is B 1 - Lamina, 2 - Midrib, 3 - Petiole
Leaf consists of 3 parts - Lamina, Midrib, Petiole. Lamina is the green, flat surface of the leaves. It consists of a small branched vein and veinlets. The vein that runs along the middle of the lamina is called midrib. Petiole is the long, thin, stalk that links the leaf blade to the stem.