The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common?  Choose the correct choice from the following answers
A) 10 and 20	B) 12 and 18	C) 30 and 16	D) 21 and 63	E) 22 and 44
16 has only the prime 2 (16=2^4) in its prime factorization, so it can not have a PAIR of distinct prime divisors in common with ANY of the numbers.   The answer is 30 and 16.
<result>C</result>
The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common?