Read the following paragraph and answer the question that follows.

You may accumulate a vast amount of knowledge but it will be of far less value to you than a much smaller amount if you have not thought it over for yourself; because only through ordering what you know by comparing every truth with every other truth can you take complete possession of your knowledge and get it into your power.

Based on the above information, which of the following statements MUST be true?

Option A is the correct answer.

The paragraph emphasizes that simply accumulating knowledge is not enough. It suggests that one must think over the information for oneself and compare every truth with every other truth to fully possess the knowledge and get it into one’s power. This process of thinking over and comparing truths can be interpreted as reflecting on the information. Therefore, if she wants to master knowledge, she must reflect on the information.

The other options (B, C, D, E) are not necessarily true based on the given paragraph. Reflecting on the information is presented as a necessary condition for mastering knowledge, but it’s not stated as a sufficient condition. That is, while reflection is necessary, the paragraph does not guarantee that reflection alone will result in mastery of knowledge. Therefore, statements suggesting that reflection will definitely lead to mastery (Options B and E), that lack of mastery implies lack of reflection (Option C), or that mastery implies reflection (Option D) are not necessarily true based on the given information.