None of the options you listed (the Three-Fifths Compromise, the Great Compromise, or the Connecticut Compromise) specifically required all states to return fugitive slaves to their owners.
The requirement for states to return fugitive slaves is actually found in the U.S. Constitution, Article IV, Section 2, often referred to as the Fugitive Slave Clause. However, it is not among the options provided.
If you are looking for a direct answer based on common knowledge, it's that the Fugitive Slave Clause in the Constitution is the correct reference for the return of fugitive slaves.