A researcher decides to test the scientific validity of the common phrase "An apple a day keeps the doctor away." What would be a valid hypothesis to investigate this specific question?
A. The daily consumption of a single apple does not change the number of visits to the doctor.
B. Eating one apple every day is good for you.
C. Those who consume apples have longer lifespans than those who do not consume apples.
D. Eating apples decreases the frequency of contracting a cold.
E. Apples are high in vitamin C.
Answer: A
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