Read the following context and choose the best option to answer the question.
Context: I liked her classes very much and have kept her notes for 10 years now . However , after I returned to Japan from California , I began to notice that Japanese people seemed to feel weird when they heard the fact I had a Vietnamese teacher . So , I stopped talking about her .
Question: Why may the narrator feel distant from her old friends ?
Options: 
A. She feels the subject of racism due to her Asian affinities .
B. None of the above choices .
C. She feels the subject of discrimination against the Japanese .
D. She feels the subject of discrimination .


D