ANSWER:
The correct option is C: "United States Environmental Protection Agency". 
Step-by-step explanation:
- The United States Environmental Protection Agency is the body in United States that studies and assesses the environment and how changes in the environment affect the people in a negative manner. 
 
- The agency is an "independent agency" that was established in the year 1970 for environmental protection. The work of the agency is to perform environmental assessment, research and education. 
 
- The agency works for prevention of pollution as well as conservation of energy. The agency works closely with several industries and also government agencies at all levels.