The correct answer is:
3. It gave those states more representation in Congress.
The Three-Fifths Compromise was an agreement reached during the Constitutional Convention of 1787, which determined that for purposes of representation in Congress, three-fifths of the enslaved population in southern states would be counted. This increased the political power and representation of southern states in the House of Representatives relative to free states, as they could count a portion of their enslaved population when determining how many representatives they would have.