Why did Nie Que feel disappointed when talking with Wang Ni in the fable Nie Que Asked Wang Ni Questions?

A、Becausehefeltsorryforthemanwhosleptinadampplaceandhadarthritis;
B、Becausehethoughteverythingseemedtobeunknownandintangible;
C、BecausehethoughtwhatWangNihadsaidmadenosense;
D、Becausehefoundthathewastoofrightenedtoliveinatree