The Supreme Court's Current Position on the Regulatory Power of Federal

The Supreme Court's current position on the regulatory power of federal agencies is that

A) only Congress, not agencies, should regulate the economy.
B) an agency can make rules so long as Congress retains a legislative veto over its decisions.
C) Congress can instruct an agency to make the decisions necessary to solve a policy problem.
D) agencies can act independently of Congress under the power of executive privilege.
E) agencies must be independent of Congress in rule making but not implementation of policy.