Answer:
If Joan wants to do business in China, she must abide by Chinese law and remove the objectionable material from the website.
Step-by-step explanation:
If you want to start a business in any place of the world, you must follow the laws and procedures of that place.
For example, if you want to start a business in Florida, the state of Florida must charter the company, and the company must follow all the regulations and requirements of the state. Additionally the company must follow and obey all the laws and regulations of the federal government (e.g. SEC, UCC, FDA, etc.).
The same applies if you want to open a business in Europe, China, Brazil, etc., and it doesn't matter if you are an American Citizen, Canadian, Mexican, etc.
The same thing happened to Google, F@cebook, etc. when they started to operate in China.