Answer:
A. US Constitution
Explanation:
The qualifications for the presidency of the United States are outlined in Article II, Section 1, Clause 5 of the U.S. Constitution, it states the following:
No person except a natural born citizen, or a citizen of the United States, at the time of the adoption of this Constitution, shall be eligible to the office of President; neither shall any person be eligible to that office who shall not have attained to the age of thirty five years, and been fourteen Years a resident within the United States.
So, in order for a person to be a President, he or she must be a natural-born U.S. citizen, or a U.S. citizen, be at least thirty-five years old and be a resident in the United States for at least fourteen years.
