The most accurate response regarding the outcome of the Opium Wars is:
The outcome of the Opium Wars were rebellions, such as the Boxer Rebellion. These rebellions were put down by Western powers.
While the Opium Wars themselves primarily involved conflict between China and Britain over trade issues, they led to a series of internal rebellions in China, including the Boxer Rebellion (1899-1901). The Boxer Rebellion aimed to expel foreign influence, but it was ultimately suppressed with assistance from Western powers.