Which was the most immediate action taken after publication of Rachel Carson's book Silent Spring?

Which was the most immediate action taken after publication of Rachel Carson's book Silent Spring?

President Kennedy ordered a panel of scientists to appraise the DDT hazard.

The chemical industry took the lead in restricting the sale and use of DDT.

President Kennedy banned DDT over the objections of experts.

DDT was banned in the United States by the Department of Agriculture.