Answer:
The correct answer is B. The Fifteenth Amendment was necessary because despite their citizenship, many African Americans were legally prohibited from voting in some states.
Step-by-step explanation:
The Fifteenth Amendment to the Constitution establishes that governments in the United States can not prevent a citizen from voting because of their race, color, or previous condition of slavery. It was ratified on February 3, 1870.
The Fifteenth Amendment is one of the Post-Civil War Amendments, known as the Reconstruction Amendments. This amendment prohibits both states and the federal government from using the race, color, or former state as a slave of a citizen as a restriction on voting. Its basic objective was to grant the right to vote to former slaves.