Discussion
Assertion (A): A monolith is chosen for an automotive catalyst despite its lower surface area per unit volume.
Reason (R): Back pressure on the engine is the overriding constraint.
Answer: C
Both are true and the reason gives the priority: a packed bed of the same activity would restrict the exhaust unacceptably, so the geometry is chosen for the hydraulics rather than the chemistry. Straight channels give a clear path.
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