Answer:
B. People moved from the country to find jobs in the city.
Step-by-step explanation:
The economic reforms launched by the Communist Party of China in 1978 led to amazing growth of double digits for over 2 decades, opened the country to world trade and investments, modernized the economy and businesses. That amazing economic rise mainly took place in the cities - industrial centers and export hubs - along the coast of China. This economic miracle spurred the largest migration of people in human history; hundreds of millions of Chinese from poor interior provinces and countryside left their places to go to the cities to look for well-paid jobs and opportunities.