The correct option is C symbionts
Symbionts are those organisms which live along with some other organisms. Lichens live in association with algae and mycorrhiza live with roots of higher plants. Hence, both lichens and mycorrhiza are symbionts.
Saprophytes are those organisms which absorb soluble organic matter from dead substrates. Example: Mushroom.
Parasites are those that depend on living plants and animals. Example: Cuscuta.