According to Constitutional Amendment 14, who is considered a citizen of the U.S.?

Amendment 14 of the United States Constitution is significant for its role in defining citizenship. The amendment states that all persons born or naturalized in the United States are citizens of the United States. This includes not only those born on U.S. soil but also those who have gone through the process of naturalization, which grants citizenship to foreigners. This provision established a broad and inclusive definition of citizenship, affirming that anyone who meets these criteria is entitled to the rights and privileges of citizenship, irrespective of their parent's citizenship status or their age.

The other options do not capture the full scope of the citizenship definition provided by the 14th Amendment. For example, limiting citizenship to only those born in the U.S. disregards the naturalization process that allows immigrants to become citizens. Similarly, setting an age requirement or restricting citizenship based on parental citizenship does not align with the Amendment's inclusive principles.