Why does Mo Yan not explore political issues in his Nobel speech?

A. Because he isn't interested in political issues

B. Because he doesn't talk about political issues in his fiction

C. There was no reason for this

D. Political issues are not appropriate for Nobel speeches

Why does Mo Yan not explore political issues in his Nobel speech?

D. Political issues are not appropriate for Nobel speeches

I think it is the best answer among the choices. From what data I read, Mo Yan said of his Nobel win that it is a literature victory, not a political victory. Thus, exploring political issues in his Nobel speech is not constructive nor appropriate.