If m is a positive integer and m^2 is divisible by 54, then the largest positive integer that must divide m is?
Options: A) 3 B) 6 C) 18 D) 12 E) 16

Rationale: m ^ 2 is divisible by 48 so m ^ 2 must be multiple of 48 . if the value of m is multiples of 18 then it will satisfy the condition . if we if m is 12 or 24 or 36 then it ans is c but if m = 54 then answer should be 16 . is the question right ? or am i missing some thing ? c
Answer: C