Answer;
A. Richard Nixon
Step-by-step explanation;
-The Environmental Protection Agency officially began operation on December, 1970. The agency was proposed by President Richard Nixon, it is the primary regulatory agency involving environmental protection in the United States.
-After several decades of increased public concern of the impact of human activity on the environment, Nixon issued Reorganization Plan No. 3 to reorganize and combine similar agencies tasked with protecting the environment.
-The new agency was tasked with enforcing environmental protection standards, conducting environmental research and collaborating with other entities to curb environmental pollution.