Much Research Is Being Done to Increase the Nitrogen- Fixing

Much research is being done to increase the nitrogen- fixing ability of plants with root nodules.Why is this an important goal for agricultural researchers?

A) By removing the bacteria from the root nodules,more fixed nitrogen will be available to the plants.
B) Nitrogen is an essential component of the amino acids used to form protein.
C) Increasing the nitrogen- fixing ability of plants will allow them to make better use of nitrogen fertilizers.
D) Decreasing the size of nodules will allow plants to fix more nitrogen into their own molecules.