Explanation
Correct answer: A.
Choice A is the best answer. The text repeatedly claims that true self-knowledge can’t possibly be achieved, and this rhetorical question emphasizes that point.
Why the other choices are wrong
Choice B
Choice B is incorrect. The underlined question doesn’t do this. The text never expresses doubts about the value of self-knowledge—rather, the text expresses doubts about the possibility of achieving self-knowledge.
Choice C
Choice C is incorrect. The underlined question doesn’t do this. The text doesn’t provide directions for how to achieve self-knowledge—rather, it claims that true self-knowledge is impossible to achieve.
Choice D
Choice D is incorrect. The underlined question doesn’t do this. The text doesn’t ever define self-knowledge, and popularity isn’t mentioned in the text at all.