The requirement for all states to return fugitive slaves to their owners is found in the Fugitive Slave Clause of the U.S. Constitution, specifically in Article IV, Section 2. However, none of the options you provided (the Three-Fifths Compromise, the Great Compromise, or the Connecticut Compromise) specifically refer to this requirement.
If you need to select one of the options, none directly apply, but it’s important to note that the Fugitive Slave Clause was part of the overall compromises made during the formation of the Constitution, which included many aspects addressing slavery.