The asexual reproduction where the vegetative part of the plant which give rise to a new plant is known as vegetative reproduction. Ginger is propagated by the rhizome. Chrysanthemum is propagated by stem cutting. Roots are used in vegetative propagation of sweet potato. The roots bear adventitious buds from which new plants can develop when it is buried in the moist soil. Such roots are called reproductive roots. Potato is propagated by eye of tuber.
So, the correct answer is option C.