What do we put on the intaglio (inner) surface of a crown to check for interferences?

To check interferences on the INTAGLIO (inside) surface of a crown before cementation, you use FIT CHECKER ADVANCED or PRESSURE INDICATOR PASTE (vinyl polyether silicone material). The crown is seated, the material is displaced by high spots/interferences, revealing where adjustment is needed. SILANE is used to bond ceramic to composite (primer for ceramic surfaces — A is for bonding, not fit checking). ZOE paste is for cementation. B is correct.