The answer is option 4: During FDR's New Deal programs
The Civilian Conservation Corps was one of the most popular New Deal Programs by President Franklin D. Roosevelt, operating from 1933 to 1942 in the U.S. It was a federally funded organization aiming to provide jobs for unemployed young men and help families that had difficulty finding jobs during the Great Depression ongoing. The job consisted of projects with environmental benefits, such as works in forest and fields, stopping erosion, as Lina Belle McCommons describes.
At that time, it was criticized for some which considered it a waste of government funds, but acclaimed by many as well for increasing employed people and leading to a public awareness of the nation's natural resources and its care.