The common materials used in 3D printers to create objects are:
a. ABS (Acrylonitrile Butadiene Styrene) - a popular thermoplastic used in FDM (Fused Deposition Modeling) printing. b. Resin - used in DLP (Digital Light Processing) and SLA (Stereolithography) printing. c. Filament - a general term that refers to the material in filament form used in FDM printers, with ABS, PLA, and others being types of filament.
While d. Silicone is used in some specialized applications, it is not commonly associated with standard 3D printing methods.
Therefore, the best answer would be c. Filament, as it encompasses various types of materials, including ABS and others. However, options a and b are also correct based on specific forms of 3D printing.