All smart people read more than six books per year, and the smartest people read more than twelve books per year. John is not a smart person. If the statements above are correct, which one of the following must be true?
A: John reads twelve books per year.
B: John reads more than six books per year.
C: John reads fewer than seven books per year.
D: John reads six books per year.
Choose A, B, C or D as your solution.
C