What is the greatest positive integer n such that 3^n is a factor of 36^50?  Pick:
A) 100
B) 200
C) 300
D) 600
E) 900
36 = 3^2 * 2^2.   36^50 = 3^100 * 2^100   The answer is 100.
<result>A</result>
What is the greatest positive integer n such that 3^n is a factor of 36^50?