Why do modern scientists use repeated experiments to develop and test hypotheses?

What did the first language sound like

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs