Answer:
The correct answer is A. Opium Wars
Step-by-step explanation:
The Opium Wars were two conflicts between the Chinese empire and the British empire. The first one lasted between 1839 and 1842 and the second one took place between 1856 and 1860. The causes of these conflicts were the commercial interests created by the British illegal traffic of opium in India and China and the efforts of the Chinese government to impose laws and control that commerce.