The correct response is:
The British Empire bought tea from China. In exchange, it sold China opium and cotton the empire had taken from India.
This three-way trade system involved the British importing tea from China, which was highly sought after in Britain. To finance this trade, the British exported opium, grown in India, to China, which led to significant social and economic issues there. Additionally, cotton and other goods from India were also part of this trade system, reflecting the interconnectedness of the economies during the British colonial period.