(A) 15th & 16th amendments
(B) ** 13th & 14th amendments
(C) 17th & 18th amendments
(D) 19th & 20th amendments
EXPLANATIONS BELOW
Concept note-1: -Passed by Congress on January 31, 1865, and ratified on December 6, 1865, the 13th Amendment abolished slavery in the United States.
Concept note-2: -These amendments were intended to guarantee the freedom of the former slaves and grant certain civil rights to them and protect the former slaves and all citizens of the United States from discrimination.
Concept note-3: -On April 8, 1864, the Senate took the first crucial step toward the constitutional abolition of slavery. Before a packed gallery, a strong coalition of 30 Republicans, four border-state Democrats, and four Union Democrats joined forces to pass the amendment 38 to 6.
Concept note-4: -Lincoln and other leaders realized amending the Constitution was the only way to officially end slavery. The 13th Amendment forever abolished slavery as an institution in all U.S. states and territories. In addition to banning slavery, the amendment outlawed the practice of involuntary servitude and peonage.