Read the excerpt from the Fourteenth Amendment of the United States Constitution.

All persons born or naturalized in the United States . . . are citizens of the United States and of the state wherein they reside.

The citizenship clause of the Fourteenth Amendment is important because it

a.) limited the number of people who can become citizens.
b,) gave everyone free passports if they became citizens.
c,) was the first time the Constitution defined what a citizen is.
d.) restricted freed enslaved people from becoming citizens.