Why is there a residency requirement to become President?

A. so no young people will be President.
B. to ensure someone is mature enough.
C. to prevent non-citizens from being President.
D. so a person will be familiar with American issues

D

Being a president, he will be the one who has the final decision of mostly all the related issues in the country.  If the president has a lot of knowledge in terms of political and economical issues of the country, it means that he will be a good president.

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