For equal sized CSTRs in series carrying out 1st order reactions of constant density, which of the following is true? (ki is the rate constant in a reactor ‘i’ in series)

• A. k1 ≠ k2 ≠ … ≠ kn, τ1 = τ2 = … = τn
• B. k1 = k2 = … = kn, τ1 = τ2 = … = τn
• C. k1 = k2 = … = kn, τ1 ≠ τ2 ≠ … ≠ τn
• D. k1< k2< …<kn, τ1 = τ2 = … = τn