The correct answer is A. Leguminous plants.
Leguminous plants are plants that have root nodules. Root nodules are small, round swellings on the roots of leguminous plants. They are formed by a symbiotic relationship between the plant and a bacterium called Rhizobium. The bacterium lives in the nodules and helps the plant to fix nitrogen from the air. Nitrogen is an essential element for plant growth, and it is not available in the soil in a form that plants can use. The bacteria in the nodules convert nitrogen gas into ammonia, which the plant can then use.
Parasitic plants are plants that live on other plants and take nutrients from them. They do not have root nodules.
Epiphytic plants are plants that grow on other plants, but they do not take nutrients from them. They get their nutrients from the air and from the rain.
Aquatic plants are plants that live in water. They do not have root nodules.