A picture framer wants to put decorative foil strips around the perimeters of two square frames. He has a 200-cm-long foil strip. He will construct the frames so that the foil strip can be cut into two pieces that can each be used in its entirety to cover the perimeter of its frame. The length of a side of one square frame is to be 3 times the length of a side of the other square frame. How should he cut the foil strip? A 50 cm and 150 cm pieces B 25 cm and 75 cm pieces C 200 cm and 600 cm pieces D 100 cm and 300 cm pieces