Another way to say <span>"Have the courage to use your own understanding," is Saper aude which loosely translates to "Dare to be wise" or "Dare to think for yourself"
So your answers is D: </span><span>Saper aude
Hope this helps.
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<span>i will help you but can u give me more of what type of answer you want</span>
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Lol hope this helps :D