In the fluid catalytic cracker (FCC), the cracking reaction is _____________ (i) and the regeneration is _______________ (ii) _______________?

A. (i) endothermic (ii) endothermic

B. (i) exothermic (ii) exothermic

C. (i) exothermic (ii) endothermic

D. (i) endothermic (ii) exothermic
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