Final answer:
Quarry tile (option a) is the unglazed ceramic floor tile with a natural clay body, also known as promenade tile. It's different than mosaic tiles, which consist of small, colored pieces used to create images.
Step-by-step explanation:
The type of unglazed ceramic floor tile with a natural clay body also known as promenade tile is a) Quarry tile. Quarry tiles are made from natural clay, pressed or extruded, and then fired to high temperatures. This process makes them dense, durable, and non-porous. They are a popular choice for both indoor and outdoor flooring where high durability is needed. Unlike mosaic tiles, which are made of small pieces of colored tile, stone, or glass to create images, quarry tiles are typically laid in a uniform pattern and are known for their natural, earthy colors.
Mosaics, on the other hand, are durable and long-lasting materials that artists use to create intricate designs on walls, ceilings, and floors. The process involves gluing small pieces of glass or stone to a surface and then applying grout to set and seal the mosaic in place.