Answer:
B. Limiting Western access to Ming China kept the country free of foreign influence for a time, but not forever.
Step-by-step explanation:
During the Ming Dynasty, China had a strong system of trade with other countries, but it was highly regulated and tightly controlled, which helped to keep out foreign influence for a while. However, over time, this policy became more and more difficult to maintain, and eventually, China began to open up more to the outside world. While this allowed for new opportunities and cultural exchange, it also brought foreign influence and interference into China, which ultimately contributed to the decline of the Ming Dynasty. So, I'd say that "b" is the best choice.