F: My sister was supposed to call me when she got to Shanghai, but she didn't. ,M: Don't worry. Her plane was scheduled to arrive only a few hours ago, probably it has just been delayed.
(A) F: Can my sister find the airline information? (B) F: I am really worried about if my sister has arrived in Beijing safely. (C) F: I am really worried about if my sister has arrived in Shanghai safely. (D) F: I’m sorry, I don’t understand. Could you say it again?
C