What advantage did britain have in its war with china

Up until the First Opium War, the foreign threats Han Chinese were used to dealing with were foreign nomadic invaders invading from the north. While Han Chinese were used to being occupied, even by foreign dynasties such as the Mongol Yuan dynasty, the foreign occupiers were always absorbed into the great ocean of Chinese culture and eventually disappeared.

b. by enlisting in the military to fight

the answer wold be b) travel among nations should be regulated by an international organization