The correct answer is B) taxation; representation in Congress.
The Three-Fifths Compromise counted each slave as three-fifths of a person for the purposes of both taxation and representation in Congress.
It all happened during the Constitutional Convention of 1787, celebrated in the city of Philadelphia, Pennsylvania. In that event, the Delegates agreed on counting slaves in the United States as three-fifths of an individual for representation in Congress and taxation purposes. This decision helped the Southern States to have more representation due to the number of slaves they used in their plantations.