Which part of the Eighth Amendment was incorporated at the state level using the Fourteenth Amendment?

A.
due process

B.
equal protection

C.
rights of national citizenship

D.
protection from cruel and unusual punishment

I think its C

https://constitution.findlaw.com/amendment8.html

https://www.law.cornell.edu/constitution/amendmentxiv

What is Amendment 8 all about? Which part of it (or the whole of it) also appears in Amendment 14?

Actually, the correct answer is D. The part of the Eighth Amendment that was incorporated at the state level using the Fourteenth Amendment is the protection from cruel and unusual punishment. The Fourteenth Amendment was adopted in 1868 and it includes the Due Process Clause, which states that no state shall deny any person life, liberty, or property without due process of law. However, it was through the Due Process Clause that the Supreme Court expanded the protection of the Eighth Amendment to apply to the states and prohibited them from inflicting cruel and unusual punishments. This incorporation of the Eighth Amendment's protection against cruel and unusual punishment at the state level ensures consistent standards of punishment across the United States.