Explanation:

- Option 1: 1978

- Correct Answer: Economic reforms in China were initiated in 1978 under the leadership of Deng Xiaoping.

- These reforms aimed to transition China from a planned economy to a more market-oriented economy.

- Key changes included opening up to foreign investment, reforming state-owned enterprises, and promoting private business.

- The reforms led to rapid economic growth and lifted millions out of poverty.

- Option 2: 1988

- No significant economic reforms were specially initiated in 1988.

- This period was more about further discussing reforms rather than new implementations.

- Option 3: 1990

- This was a period of continued reform but not the start.

- The focus here was more on deepening earlier reforms.

- Option 4: 1991

- Similar to 1990, reforms were ongoing but not initiated.

- China continued to integrate itself more globally, especially after the Tiananmen Square crisis.

Your answer is right.