Tuberose is commercially propagated by

Correct option is C

Tuberose is a bulbous ornamental plant.
Commercial multiplication requires uniform planting material.
Bulbs ensure true-to-type plants and early flowering.
Corms and tubers are not used in tuberose.
Vegetative propagation through bulbs is standard practice.
Hence, bulbs are used for commercial propagation.
Therefore, option (c) is correct.