Some species of nitrogen-fixing bacteria have adapted to grow in nodules of legumes such as peas and clover. these bacteria make nitrogen available to the plant and in turn, receive nutrients from the tissues of the plant. this type of interaction is known as a. parasitism. b. commensalism. c. hybridization. d. mutualism.

Mutualism

Explanation:

The interaction between two organism in which both of them benefits each other by their activity is known as Mutualism.

Here, the nitrogen fixing bacteria interacts with the legumes and obtain nutrients from them. In return, the bacteria fixes nitrogen for the plants.

in the above cases both of the organisms are getting benefit mutually without being affected in a negative way. This is an example of Mutualism.