How did president lincoln's emancipation proclamation affect the institution of slavery?

a.
it freed all slaves within the united states' borders.

b.
it freed only the slaves in the border states.

c.
it freed all slaves north of the mason-dixon line.

d.
it freed only the slaves in confederate territory.

I am pretty sure my answer is correct

D. It free only the slaves in Confederate territory

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D. It freed only the slaves in Confederate territory.

Explanation:

I took a test and it had this question and I got it right.

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration