Which is a constitutional qualification to be president?

college educated
experience in another political field
military experience
natural-born citizen of the United States***

Yes, you're right.

For me it is a college educated and has an experience in another political field.

The constitutional qualification to be President of the United States is being a natural-born citizen. This means that someone must be born a United States citizen either through birth on U.S. soil or by being born to U.S. citizen parents.

To find this answer, you can read the United States Constitution. Specifically, you would need to refer to Article II, Section 1, Clause 5, which states, "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."

It is important to note that college education, experience in another political field, or military experience are not constitutional qualifications to be President. These factors may be considered by voters when choosing a candidate, but they are not specifically required by the Constitution.