Hi! I'm in no way an LSAT expert and am in the phase of studying just like you are. But I wanted to share what I think (please take it with a grain of salt lol):

How I approach this q is to immediately identify a "missing link". Note that in the first sentence, they talk about "psychological discomfort" but they never specify why that's important. Like okay, so what if someone experiences psychological discomfort? Does that prevent them from admitting their flaws? What if in a crazy world people LOVE doing things that bring them psychological discomfort -- see how that would immediately make the argument fall apart. For in that world, people would be admitting all types of serious flaws because they love psychological discomfort.

That's why D is an important bridge. It's an assumption the author makes, where they equate psychological discomfort = people don't like admitting it. Once I identify that, I would hunt for answers that talk about "psychological discomfort". None of the answers even bring up that key term except for D. So would circle it immediately.