This must be 3/4 of all the states.
This means

well, since this is not possible,(you can only have an approval of a full state) and it cannot be less, it might be more , then it must be
38 states.
The answer is d the bill of rights
In a federal system, individual states and the national government
share ultimate authority, meaning that in some areas the federal
government is supreme, while in others the state governments are
supreme.
In a confederation, the state governments are considered supreme,
except for those powers specifically delegated to the federal
government.
Basically C.