The greatest common factor of positive integers m and n is 10. What is the greatest common factor of (2m^2, 2n^2)? Choose the correct choice from the following answers.
A) 2 B) 10 C) 100 D) 200 E) 400
m = 10j and n = 10k, where the greatest common factor of j and k is 1.   2m^2 = 2*10*10*j^2 and 2n^2 =  2*10*10= 
<gadget id="calculator"> 2*10*10</gadget>
<output>200</output>
200   The answer is 200.
<result>D</result>
The greatest common factor of positive integers m and n is 10. What is the greatest common factor of (2m^2, 2n^2)?