For a heterogeneous catalytic reaction, A + B ? C, with equimole feed of A and B, the initial rate rA0 is invariant with total pressure. The rate controlling step is______________________?

A. Desorption of C

B. Surface reaction between absorbed A and absorbed B

C. Surface reaction between A in the gas phase and absorbed B

D. Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase

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