Two congruent triangles, ΔABC and ΔRST, are shown below.
Describe a sequence of transformations that exhibits the congruency of ΔABC and ΔRST.
A: Reflect ΔABC across the y-axis and then translate the resulting figure 4 units down.
B: Reflect ΔABC across the x-axis and then translate the resulting figure 4 units to the right.
C: Reflect ΔABC across the x-axis and then reflect the resulting figure across the y-axis.
D: Reflect ΔABC across the x-axis and then rotate the resulting figure 90 degrees counterclockwise about the origin.