Final answer:
Opium was the crop that had devastating consequences in China as a result of its trade with India.
Step-by-step explanation:
The crop that was sent to China from India with devastating social, economic, and political consequences was Opium. During the 18th and 19th centuries, the British East India Company monopolized the opium trade and pushed its cultivation in India. This led to a huge increase in opium addiction in China, creating countless social problems and draining China's silver supply. The Opium Wars between China and the British Empire were a direct result of this.
Learn more about Opium trade between India and China