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Roots are the vital underground part of vascular plants. The primary function of the root is providing anchorage to the plants by tightly holding the soil which makes the tree stand straight on the ground. It also helps in the absorption of water and dissolved minerals and the storage of minerals.

There are various modifications of root for different purposes which play different functions such as storage, and support. Epiphytic roots are the type of root modification where the root enables a plant to grow on another plant. For example, In the orchid plant, the epiphytic roots develop a spongy tissue to absorb moisture.

Prop roots are the type of root that arises from the stem to provide additional support.

Adventitious roots are the modified roots that arise from part other than the root axis.

Aerial roots develop from top branches and extend to the ground.

Therefore, option ‘a’ is the correct answer.

Epiphytes are the modification of roots for support which allows the plant to grow on another plant.