单选题] Read the letter written by an international student who is studying abroad, and decide which adaptation stage the student is probably at. Dear Nicky, Thanks for your letter. It was lovely to hear from you. I’ve been thinking about your question about what I find strangest living in China – but the trouble is I’ve been here so long and have settled into the way of life so much that everything seems perfectly ordinary! So if you want to find out you’ll have to come out to see for your self with a fresh pair of eyes. I can be your guide!
选项：

A:excitement
B:confusion
C:frustration
D:appreciation