During Reconstruction, the Freedmen's Bureau provided a number of services but was rejected by most African Americans.
and was supported by most white Southerners.
but lacked the authority to enforce civil rights laws.
and was spearheaded by Democrats in Congress.

Option C, but lacked the authority to enforce civil rights laws, is the right answer.

Explanation:

The U.S. Congress established the Freedmen's Bureau in the year 1865 to provide assistance to a large number of former slaves and poor whites in the south. This bureau helped the former slaves and poor whites by providing food, medical aid and housing facilities along with legal assistance.

Though it tried to locate former slaves on land evacuated during the Civil War,  the bureau could not carry on its programs as they had a shortage of funds and staff.

Therefore, the bureau lacked the authority to enforce civil rights laws.