The greatest common factor of positive integers m and n is 15. What is the greatest common factor of (2m^2, 2n^2)? Choose the correct choice from the following choices.
A) 15
B) 30
C) 150
D) 450
E) 900
m = 15j and n = 15k, where the greatest common factor of j and k is 1.   2m^2 = 2*15*15*j^2 and 2n^2 =  2*15*15= 
<gadget id="calculator"> 2*15*15</gadget>
<output>450</output>
450   The answer is 450.
<result>D</result>
The greatest common factor of positive integers m and n is 15. What is the greatest common factor of (2m^2, 2n^2)?