Which statement best describes the process that takes place in these nodules?

The answer is B. Bacteria in the plant nodules convert nitrogen from the soil into molecules the plants can use.

B. Bacteria in the plant converts nitrogen from the soil into molecules  that plants can use.

Explanation:

Root nodules are present in roots of plants which are in symbiotic relation with the nitrogen-fixing bacteria.

Nitrogen fixing bacteria fix nitrogen from the atmosphere and take up from the soil and convert into a form which is usable by the plants. These play an important role in nitrogen cycle.

i think they are all correct

explanation:

they seem good