Veneering means

ANS:C - thick layer of superior wood glued to inferior wood

The given answer c is right. Veneer itself is a thin material but veneering is a process of combining several veneer thus making it a thick layer and gluing it to inferior wood. In woodworking, veneer refers to thin slices of wood and sometimes bark, usually thinner than 3 mm (1/8 inch), that typically are glued onto core panels (typically, wood, particle board or medium-density fiberboard) to produce flat panels such as doors, tops and panels for cabinets, parquet floors and parts of furniture.