Policy in china allowed economic growth at the fastest sustained rate between 1980 and the early 2000s than any other country. a. revolving-door b. open-door c. locked-door d. closed-door

I think it is B. because the open-door policy in China allowed economic growth at the fastest sustained rate between 1980 and the early 2000s than any other country. The Open-door policy refers to the foreign affairs toward the United States' policy that has been established.