The preferred material for repair of fractured denture base is:: (A) Chemically cured resin, (B) Heat cured resin, (C) Light cured resin, (D) Vinyl resin
Answer is A. REPAIR OF ACRYLIC RESIN DENTURES
An acrylic denture fractured in service can be repaired. Repair resins maybe:

Heat cure (OR)
Self cure

Heat cured resin
These resins are cured at 74oC for 8 hours or more. The use of a heat-cured resin will tend to warp the denture during processing.
Self-cured resin
Although the repair with a self-cured resin invariably has a lower transverse strength than that of the original heat-cured denture base resin, self-cured resins are usually preferred because warpage is insignificant as curing is done at room temperature.
Reference: Mannapallil Basic SCIENCE OF DENTAL MATERIALS, 4th ed page no 561