Which of the following statements best describes china’s closed-door policy prior to the 1800s? a. the chinese government made it illegal for citizens to travel abroad, because they wanted to limit interactions with westerners. b. interactions between the chinese and westerners were limited, and only one port was open for trade. c. all countries had equal access to chinese ports, except for japan, with whom trade was closed. d. communism encouraged equal distribution of wealth among the chinese people and discouraged international trade