The Civil Rights Act of 1866 was significant because

I. it meant that Congress rather than the President would determine Reconstruction
policies

II. it showed President Andrew Johnson's unwillingness to accept the Radical Republican approach to Reconstruction

III. it was the first major piece of legislation that became law over a presidential veto

IV. it guaranteed that former slaves would control the state legislatures in the South

A. III only
B. I, II, and III only
C. II and IV only
D. I and III only