The statement that correctly compares the differences between Ethiopia’s and Siam’s resistance to imperialism is:
Ethiopia was forced to resort to violent resistance to maintain independence, while Siam used diplomacy.
Ethiopia famously resisted imperialism through military means, most notably in battles such as the Battle of Adwa against Italy in 1896, where they successfully maintained their independence. In contrast, Siam (modern-day Thailand) effectively used diplomatic strategies to navigate imperial pressures from Western powers and managed to maintain its sovereignty without resorting to military conflict.