What is the purpose
of the Constitution's
rules about who can
be president?

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 .

Explanation:

the answer is

answer; /// i believe that the correct answer is (d)the huang he river valley;