The rationale for Congress being bicameral was a compromise between which two groups: a) Abolitionists vs Non-Abolitionists
b) Federalist vs. Anti-Federalists
c) Slave vs. Non-Slave Owners
d) Small vs. Large State Populations

d) Small vs. Large State Populations

Explanation:

The Bicameral system divided the United States' Congress into two:

- Senate

Every single states can appoint 2 Senators to represent their interest within the government . Regardless of the number of population that exist in each states.

- House of representatives

The number of members that each states can put in House of representatives  is dependent on the number of their population. The more population a state has will mean that the state can elect more people into the House.

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.