100 POINTS + BRAINLIST! What was one reason that Georgia remained under US military control after it held its second Reconstruction-era constitutional convention in 1867–1868?

A
Georgia refused to ratify the Fifteenth Amendment and grant African American men the right to vote.

B
Georgia refused to ratify the Thirteenth Amendment and free African Americans held in slavery.

C
President Andrew Johnson took control of Reconstruction and set harsh preconditions for readmission to the Union.

D
President Abraham Lincoln took control of Reconstruction and set harsh preconditions for readmission to the Union.