Answer:
D. Many Black people were enslaved and kept from being citizens when the Constitution was written, but the era of Reconstruction gave them citizenship.
Step-by-step explanation:
During the era of Reconstruction, amendments such as the 13th, 14th, and 15th were ratified, abolishing slavery, granting the right to citizenship to all formerly enslaved individuals and all born in the United States, and prohibiting the denial of voting rights based on race, color, or previous condition of servitude, respectively.