Final answer:
The true statement about experiments and hypotheses in science is that a valid experiment must have repeatable results (C). Hypotheses do not need to be proven true for an experiment to be valid; they must be testable and falsifiable. Science is based on facts but also involves a process that accommodates new information and changing understandings.
Step-by-step explanation:
Among the statements provided, the one that is true is C) A valid experiment must have results that can be repeated. For a hypothesis to be considered as part of the scientific method, it must be testable and falsifiable. This means that experiments should be able to be conducted under controlled conditions that possibly refute the hypothesis. However, a hypothesis does not need to be proven true to make an experiment valid; rather, it must simply be testable and falsifiable, as an experiment could also result in a hypothesis being revised or rejected due to contradictory evidence.
It's important to understand that statement E) Science is based on fact is partially true. Science is indeed based on empirical evidence and facts, but scientific understanding is also subject to change with new evidence or better explanations. Science involves formulating hypotheses that can be supported or refuted through experimentation or observation, thus creating knowledge that is always open to refinement and improvement.