Which of the following can be used to replace the body of mystery so that mystery will return the same result for all values of y?
public static int mystery(int y)
{
y = 2 * y + y;
y = 2 * y + y;
return y;
}
A) return 9 * y;
B) return 7 * y;
C) return y;
D) return 3 * y;
E) return 4 * y;