The most appropriate antonym for "rebellion" is "loyalty." Rebellion involves resisting or opposing authority, while loyalty implies faithfulness and allegiance to a person, group, or cause. The other options— "uprising" (an act of resistance or rebellion), "sedition" (incitement to rebellion), and "allotment" (the action of allotting or assigning something)— are either synonyms or closely related to the concept of rebellion.

"Reduction" involves the act of making something smaller or less in size, quantity, or degree. On the other hand, "promotion" typically refers to the act of increasing or advancing something, such as promoting a cause or moving to a higher rank or position. In short, reduction involves decreasing, while promotion involves increasing or advancing.

"Exodus" refers to a mass departure or exit of people, often used to describe a large group leaving a place. The antonym, "Homecoming," signifies a return or arrival back to one's home or place of origin. Therefore, "Homecoming" is the opposite of "Exodus" as it involves people coming back home rather than leaving.