Herbert Hoover’s approach to ending the Great Depression is best described as:

The correct answer is A. Voluntary cooperation.

Herbert Hoover believed in the principles of voluntary cooperation among businesses, labor, and government to resolve the economic crisis of the Great Depression. He encouraged private sector initiatives and did not favor direct government intervention in the economy, which marked a significant aspect of his approach during that time. He thought that working together voluntarily would help to stabilize and recover the economy. If you have further questions or need more details, feel free to ask!