The correct answer is B. Experimentation
Step-by-step explanation:
In science, understanding a natural phenomenon, event or fact implies following a set of rigorous stages that include observing a phenomenon or event, formulating possible explanations or hypothesis about it and then using experimentation to try to prove it, which implies testing the phenomenon, event or fact being studied multiple times usually using same conditions and comparing all the results obtained to confirm the hypothesis or on the opposite discard it, and finally publish the results obtained. Thus, trying to demonstrate a fact by testing it is experimentation.