Answer: b) planting trees to reforest land
Explanation:During the Great Depression, the Civilian Conservation Corps (CCC) was a work relief programme that recruited millions of young men on environmental projects. Many consider the CCC to be one of Roosevelt's most prolific New Deal programmes, having planted over three billion trees and constructed trails and shelters in over 800 parks throughout the country during its nine-year tenure. The CCC contributed to the modern national and state park systems that we enjoy today.