Final answer:
A statement does not need to be completely verifiable to be a hypothesis. The key requirement for a hypothesis is that it must be testable and falsifiable, not necessarily verified in full.
Step-by-step explanation:
Among the options provided, the answer is D. Must be completely verifiable. A hypothesis is a proposed explanation made on the basis of limited evidence as a starting point for further investigation. A hypothesis does not need to be completely verifiable, but it must be testable and falsifiable. This means that there should be some empirical way to check whether the hypothesis is incorrect; however, it doesn't mean that a hypothesis has to be verified to its entirety. For instance, a statement that involves supernatural or metaphysical elements would neither be testable nor falsifiable, and therefore, it wouldn't make a valid scientific hypothesis.
Hypotheses are also expected to be non-normative and not value-based (C. Not normative or value based), which means they should not be influenced by personal feelings, interpretations, or prejudice. A hypothesis should be stated in such a way that it can be scientifically tested using accepted research methods, which include controlled experiments and observational studies.