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Which set contains only prime numbers?

Question 1:

Which set contains only prime numbers?

A. 2, 3, 5, 7,11,13, 17

B. 1, 4, 11, 13, 15, 17

C. 2, 3, 5, 7, 9, 11, 37

D. 1, 3, 5, 7, 9, 11, 13

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