Question

An agreement to count slaves as three-fifths of a person was related to A. the way in which population would be counted in each state. B. the creation of an upper and a lower house in Congress. C. the number of Senators each state would have. D. the denial of African Americans the right to vote.

Answer 1

The agreement to count slaves as three-fifths of a person was related to A. the way in which population would be counted in each state. The counting of population of slaves was essential for legislative representation and taxing purposes. 

Answer 2

Answer; 
A. the way in which population would be counted in each state. 

An agreement to count slaves as three-fifths of a person was related to the way in which population would be counted in each state.  

Explanation; 
The three-fifths Clause, does not deny that blacks are full persons, however it addresses whether and how slaves should be counted for the purpose of determining the number of representatives in Congress. 
Northern delegates favored omitting slaves entirely when determining representation and thus denying Southern states the advantage in the national legislature. This allowed three-fifths of the slave populations to count toward determining representation.