Kapton is a polyimide developed by DuPont which has an excellent stability in the temperature range of 0K to 673K) . Therefore, it is widely used in the aircraft and space industry although its resistance to mechanical wear is inferior to that of other polymers, such as Mylar (polyethylene terephthalate) . Which of the following molecules can be either starting materials or intermediates in the synthesis of Kapton? 
A) I, II
B) II, III
C) I, III
D) III, IV
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