Evaluating the Assertion:
- China adopted market reforms to boost economic growth and enhance opportunities in trade, investment, and industrial sectors.
Evaluating the Reason:
- While social infrastructure improvements contributed to better human development indicators, this is a separate aspect of policy-making and does not directly explain market-driven economic reforms.
Conclusion: Both statements are true but are not directly related in a cause-effect manner. Hence, the correct answer is \( \mathbf{(B)} \).