The correct answer is C) the 14th Amendment.
The other options of the question were A) the 19th Amendment. B) the 15th Amendment. D) the 26th Amendment.
The constitutional amendment that extended citizenship to formerly enslaved people was the 14th Amendment.
The 14th Amendment to the United States Constitution was part of the important legislation in the time of Reconstruction. It was adopted on July 9, 1868, and granted protection under the law to all former African American slaves and gave them US citizenship.