Answer:
B. World War ll
Step-by-step explanation:
B. World War II
The beginning of government research and protection of the environment in the United States can be traced back to World War II. During this time, there was an increased focus on industrial production and technological advancements, which also led to environmental concerns. The U.S. government began to recognize the need for environmental conservation and protection as a result of wartime efforts and the associated environmental impacts. This eventually led to the development of environmental regulations and agencies like the Environmental Protection Agency (EPA) in the years following World War II.