Why would southern delegates to the Constitutional Convention have opposed the Three-Fifths Compromise?

Question

Responses
A They feared that the President would eventually become "king" in the United States.They feared that the President would eventually become "king" in the United States.
B They believed it would be insufficient in protecting the United States from invasion.They believed it would be insufficient in protecting the United States from invasion.
C They opposed the creation of a Congress that would give states an equal number of Senators.They opposed the creation of a Congress that would give states an equal number of Senators.
D They feared industrial states with a larger populations should have more representation in Congress.They feared industrial states with a larger populations should have more representation in Congress.
E They wanted their full population of slaves to be counted for purposed of Congressional representation

Answer 1

E They wanted their full population of slaves to be counted for purposes of Congressional representation