The greatest common factor of positive integers m and n is 9. What is the greatest common factor of (2m^2, 2n^2)? Choose the correct choice from the following options:
A) 9 B) 81 C) 162 D) 324 E) 405
m = 9j and n = 9k, where the greatest common factor of j and k is 1.   2m^2 = 2*9*9*j^2 and 2n^2 =  2*9*9= 
<gadget id="calculator"> 2*9*9</gadget>
<output>162</output>
162   The answer is 162.
<result>C</result>
The greatest common factor of positive integers m and n is 9. What is the greatest common factor of (2m^2, 2n^2)?