Which of the following is a good question to ask in order to start a conversation with a foreigner？

Which of the following is a good question to ask in order to start a conversation with a foreigner？
A.What is something that has surprised you the most about teaching in China？
B.How long have you been in China？
C.Can you use chopsticks？
D.Can you speak Chinese？
正确答案：What is something that has surprised you the most about teaching in China？