Because the theme statement can't be used with other stories/ it's too specific.
The belief was that there was a distinct order of living things: Chinese, barbarians, and beasts. That's why they made all foreign diplomats bow down to the Emperor and why they completely isolated the country to show that it's self sufficient.
The answer is D.
Minnie Wright wants to be sociable. She wants to be more than an isolated housewife while her husband is a man who is controlling and unkind to her.
