The 14th Amendment to the Constitution includes all of the following provisions EXCEPT
a guarantee of equal protection under the law for all citizens.
the guaranteed right to vote for adults, regardless of gender, race or age.
citizenship in both the nation and its states for all persons born or
naturalized in the US.
loss of representation in Congress for states that denied qualified citizens
the right to vote

D) loss of representation in Congress for states that denied qualified citizens the right to vote.

Explanation:

The purpose of the 14th amendment was adopted in 1868 to ensure that all the Black people who has just been freed from slavery able to integrate into the society and considered as citizens.

This is why the 14th amendment guaranteed Black people with the right to vote, protection under the law, and right of citizenship.

Protection against  loss of representation in Congress for states that denied qualified citizens the right to vote was adopted in 1870 as a part of the 15th amendment of the constitution.