Which development provides the strongest evidence of Tennessee's willingness to cooperate with the northern Republican platform in the interest of rejoining the Union?

a. the election of Rutherford

b. Hayes

b. the repeal of the Fifteenth Amendment

c. the adoption of the Constitution of 1870

d. prosecution of the Ku Klux Klan and the White League

Answer: C

The strongest evidence of Tennessee's willingness to cooperate with the northern Republican platform in the interest of rejoining the Union is the adoption of the Constitution of 1870.

Moreover, this is the period when the Republicans dominated the congress and controlled the reconstruction era policy after the radical faction in the Republican Party.