Trapezoid ABCD is congruent to trapezoid A"B"C"D" . Which sequence of transformations could have been used to transform trapezoid ABCD to produce ​ trapezoid A"B"C"D" ​ ? ​ A. Trapezoid ABCD ​ was reflected across the y-axis and then across the x-axis. ​ B. Trapezoid ABCD ​ was reflected across the y-axis and then translated 7 units up. ​ C. Trapezoid ABCD ​ was translated 7 units up and then 12 units left. ​D. Trapezoid ABCD ​ was reflected across the x-axis and then across the y-axis.