What was the most significant result of the Opium Wars?

China’s navy was exposed as incompetent.
China could no longer impose tariffs.
They increased Britain’s influence in China.
They decreased Europe’s influence in China.

France allied itself with america because a -the american rebels had modeled their movement after the french revolution b- france wanted to weaken britain c- france wanted to wanted to regain louisiana d- the french needed american support in their war with the native americans