What First Symbolized the Transfer of Initiative in Reconstruction from the Executive

Multiple Choice

What first symbolized the transfer of initiative in Reconstruction from the executive to the legislative branch?

A) Congress overriding President Johnson's veto of the Civil Rights Act and the extension of the Freedmen's Bureau.
B) Congress reducing the military appropriation for 1866.
C) The impeachment of President Johnson.
D) The Supreme Court ruling in the case of Ex parte Milligan.