Which of the Following Would Be a Good Example of a Hypothesis

Which of the following would be a good example of a hypothesis in the scientific method process? Paired item 1)

A) a clinician confirms that taking a vitamin every day will decrease the level of tiredness in people
B) a clinician tells a patient that taking a vitamin every day, may decrease the level of tiredness in people
C) a clinician contemplates that taking a vitamin every day, may decrease the level of tiredness in people