I would say that it means to make sure you don’t become your own worst enemy. As in your brain can solve problems around you, but also create them.
The narration from "Two Kinds" by Amy Tan reveal about Jing-Mei's character is that she is afraid that she'll be a disappointment if she doesn't become a prodigy. It can be observed that from the first lines of the poem, she is entirely obsessed in becoming the prodigy for herself and for her parents. And deep inside, if she do not showcase her talents immediately, she feels that she would just be nothing in the eyes of everyone. Not just for herself but also for her parents.
The answer D. Trustworthy because a credible source cannot be biased, useless or persuasive if doing research foe an essay.
The answer is d - so that you can match your rhetorical strategy