The __________ clauses in the Constitution collectively prohibit states from enacting laws that unduly discriminate in favor of their residents.

A. Due Process
B. Equal Protection
C. Establishment
D. Privileges and Immunities

D - Because the purpose of the U.S Constitution is to promote nationalism.

D is right.

The correct answer is B. Equal Protection clauses.

To arrive at this answer, you would need to understand the different clauses in the Constitution and their purposes. The Equal Protection Clause is part of the Fourteenth Amendment, which was ratified in 1868. This clause states that no state shall deny any person within its jurisdiction the equal protection of the laws.

The Due Process Clause, indicated by option A, is also part of the Fourteenth Amendment. It states that no state shall deprive any person of life, liberty, or property without due process of law. While this clause is important for protecting individual rights, it doesn't specifically address issues of discrimination or favoritism among residents.

The Establishment Clause, indicated by option C, is found in the First Amendment. It prohibits the government from establishing a state religion or promoting one religion over others.

The Privileges and Immunities Clause, indicated by option D, is found in Article IV of the Constitution. It prohibits states from discriminating against citizens of other states by denying them the privileges and immunities enjoyed by its own citizens.

Given the context of prohibiting states from enacting laws that unduly discriminate in favor of their residents, the Equal Protection Clause is the most appropriate answer.