The correct option is D because it expresses the feeling of not having time to learn about oneself deeply. It is the only one of the option that actually expresses the theme that is asked in the question.
I think it would be D. because A is talking about sitting in a chair, B is about seeing, C is about learning a subject, and D is talking about not knowing how to learn about yourself because you spend your time in a classroom learning about other things.
