Which of the following statements describes the MAIN idea of Article IV?

A
The government of the United States will protect every state from harm.
B
Every state in the United States must have the same laws, which are created by Congress.
C
Each state of the United States has certain rights and responsibilities; Congress makes decisions about states.
D
Congress is in charge of the land in the United States; only Congress can determine whether land is made into a state.