The correct option is D Root
The roots of the banana plants are the only parts that are not consumed as food by humans.The parts of the plant that we can eat are the inner stem, flower, raw banana and ripe banana. They are eaten commonly in South Asia and South-East Asia. The parts we do not eat are its root, leaf and outer peel of stem. The leaf is used as a plate for having food, especially during festivals. The whole part of the banana plant contains medical benefits as well.