Which set of transformations has been performed on triangle PQR to form triangle P'Q'R'?
A. Dilation by a scale factor of fraction 1 over 2 followed by reflection about the x-axis
B. Dilation by a scale factor of 2 followed by reflection about the x-axis
C. Dilation by a scale factor of fraction 1 over 2 followed by reflection about the y-axis
D. Dilation by a scale factor of 2 followed by reflection about the y-axis