The correct option is (c) Vanda.
Explanation:
The aerial or epiphytic roots are thick, irregular and hang down in the air. They do not have root caps and root hair. Instead they possess a covering of dead spongy tissue known as velamen. With the help of velamen the epiphytic roots are able to absorb water from moist atmosphere, dew and rain e.g., Vanda, Dendrobium, etc.