Which of the following integers is NOT a divisor of x if x = (21)(3^7) – (2)?
Choose the correct choice from the following options:  A) 5  B) 11  C) 12  D) 25  E) 55
(21)(3^7) is divisible by 3 but 2 is not divisible by 3.   Therefore (21)(3^7) - 2 is not divisible by 3 and thus not divisible by 12.   The answer is 12.
<result>C</result>
Which of the following integers is NOT a divisor of x if x = (21)(3^7) – (2)?