OMG, after reading that sentence I just had a little post traumatic stress lmao. I was a nurse before I decided to pursue medicine and ALL our tests in nursing were exactly like that and you had to pick the BEST or prioritize your answer or else it's wrong and all the answers could work. It's one thing to memorize but it's another to take what you learn and apply it to a situation. It'll come with time my friend, just work at it.
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EDIT: A little trick I keep in mind when I take those type of test that ask to prioritize or best answer, I always try to think of my ABC. What do I wanna accomplish first that is absolutely important? For example burn patient with burns to the face and trunk, what do you assess first? Breathing.