Answer is c.
Goal #1 of shaping is to facilitate cleaning by removing restrictive dentin that allows and effective volume of irrigant to work deeper and circulate in all aspects of the root canal system. Additionally it serves to eliminate the pulp, bacteria and their toxins.
Goal #2 of shaping is to facilitate obturation compactly in three dimensions. It removes canal contents and creates a smooth tapered opening to the terminus which allows the unimpeded insertion of an obturating material, by the removal of restrictive dentin and allowing instruments to work deeply in the canal preparation.
Cleaning of the canal is done by irrigants that either dissolve, dissolute, lubricate and rinse debris from the canal while the canal is being shaped. It is the files that produce shape and the irrigants that clean the canal system.
The final shape is specific for the anatomy of each root.
(Pathways of the Pulp 8th, p235)
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