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8) When the concentration of A is doubled, the rate for the reaction: 2 A + B→2 C quadruples. When the concentration of B is doubled the rate remains the same. Which mechanism below is consistent with the experimental observations? A) Step 1: 2 A →D (slow) Step 2: B + D →E (fast) Step 3: E→2 C (fast) B) Step 1: 2 A ⇌D (fast equilibrium) Step 2: B + D →E (slow) Step 3: E→2 C (fast) C) Step 1: A + B →D (slow) Step 2: A + D⇌2 C (fast equilibrium) D) Step 1: A + B⇌D (fast equilibrium) Step 2: A + D →2 C (slow)