Why was President Abraham Lincoln's plan for Reconstruction referred to as the "Ten Percent Plan"?

Question

A.
Ten percent of a state's legislators were required to be African American in order for the state to be readmitted to the Union.

B.
Ten percent of a state's debt to the federal government had to be repaid in order for the state to be readmitted to the Union.

C.
Ten percent of a state's agricultural land had to be redistributed to freedmen in order for the state to be readmitted to the Union.

D.
Ten percent of a state's voters had to swear allegiance to the United States in order for the state to be readmitted to the Union.

Answer 1

The correct answer is:

D. Ten percent of a state's voters had to swear allegiance to the United States in order for the state to be readmitted to the Union.

Lincoln's "Ten Percent Plan" proposed that a Southern state could be readmitted to the Union once ten percent of its voters (based on the 1860 election) took an oath of allegiance to the Union and accepted the end of slavery. This plan was intended to encourage a quick and lenient reconstruction process.