An activated complex (transition state) is: (Choose one) and please explain. A. A substance that acts to increase the rate of a raction without itself being consumed. B. A stable molecule that is formed during an early step of a reaction, and consumed in a later step. C. A substance that forms during a reaction that has a definite, well-known structure. D. The arrangement of atoms at the top of the potential energy barrier. E. A molecular species with normal chemical bonds that is produced during a reaction

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