If n is a positive integer and n^2 is divisible by 200, then what is the largest positive integer that must divide n?  Choose the correct choice from the following answers.
A) 10 B) 15 C) 20 D) 36 E) 50
200 = 2^3 * 5^2   If 200 divides n^2, then n must be divisible by 2^2 * 5 = 20   The answer is 20.
<result>C</result>
If n is a positive integer and n^2 is divisible by 200, then what is the largest positive integer that must divide n?