The correct responses regarding the Thirteenth, Fourteenth, and Fifteenth Amendments to the Constitution are:
B - were necessary to secure the civil rights of the freedmen.
C - were necessary to secure the civil rights of all Americans.
While option D has some truth to it in the context of Radical Republican support for these amendments, they were not passed and ratified as a group in a formal sense but rather separately. Options A and E are inaccurate; while there was support for these amendments in the North, the political dynamics were much more complex, and they were not passed due to Andrew Johnson's presidency as he opposed many of the Reconstruction efforts.