How does the reorganization act represent the growth of the informal powers of the president?

The Reorganization Act of  that was passed on April 3, 1939 is an Act of the United Stat es Congress giving the U.S. President the power to employ more confidential staff and restructure within definite limits the executive branch for two years and will be subject to legislative veto. It was the first time the executive branch had undergone a major restructuring since 1787. This led to the creation of the Executive Office of the President through Reorganization Plan No. 1.

Ithink the answer you are looking for is (b).