Which sentence shows correct capitalization?

Question

Mr. Brown always makes his students read both the Bill of Rights and the Constitution of the United States.

Mr. Brown always makes his students read both the Bill Of Rights and the Constitution of the United States.

Mr. Brown always makes his students read both the Bill of Rights and the constitution of the United States.

Mr. Brown always makes his students read both the bill of rights and the constitution of the United States.

Answer 1

Mr. Brown always makes his students read both the Bill of Rights and the Constitution of the United States.