The correct answer is they were not allowed to leave China and were obligated to wear Chinese clothing.
European visitors were forced to observe the following restrictions in Pekin during emperor Qian Long’s time: they were not allowed to leave China and were obligated to wear Chinese clothing.
European visitors were not allowed to leave China. European visitors were required to stay in certain locations. They also were obligated to wear Chinese clothes when they were in Pekin. Emperor Qian Long was very strict and demanding. He did not like visitors. He had strong regulations in his empire. He even insulted Europeans in that he questioned the envoy’s ability to understand his responds to the king’s request.