Answer:
the answer is D: by offering equality under the law to all citizesn
Explanation:
Ratified July 9, 1868, the Fourteenth Amendment granted citizenship to all persons "born or naturalized in the United States," including former enslaved persons, and provided all citizens with “equal protection under the laws,” extending the provisions of the Bill of Rights to the states (United States Senate, 2019).
https://www.senate.gov/artandhistory/history/common/generic/CivilWarAmendments.htm
Black american were given the right to vote on Feb 3, 1870
