The answer is D. Holmes uses facts and observations to help him reach conclusions and solve cases
It takes more than working in a lab, wearing a lab coat, or making random guesses that turn out to be true to be a scientific detective. It's his ability to make observations and use facts to get to the end of the case.
Btw, there's no medals on here, I believe what you mean is Brainliest. Just for future reference! :)