The correct option is C Orchid
Ephiphytic or hygrscopic roots are aerial roots that help absorb moisture from air. These are found in epiphytic plants like orchids (e.g. Vanda).
Cuscuta is a parasitic plant and has haustoria or parasitic roots.
Dahlia has adventitious roots that develop adventitious buds for reproduction.
Salvinia is an aquatic floating fern whose roots are modifications of leaves.