The correct answer is: C. Mortar
Mortar is a thick paste of cement, sand, and water used to bind masonry units together. It is also used to fill in gaps between masonry units and to provide a smooth surface for plaster or tile.
Concrete is a mixture of cement, sand, gravel, and water that is used to create structures such as buildings, roads, and bridges. It is a strong and durable material that can withstand a variety of weather conditions.
RCC is a reinforced concrete structure that is made by adding steel reinforcement bars to concrete. The steel reinforcement bars help to strengthen the concrete and make it more resistant to cracking.
Kiln is a furnace used to heat materials to high temperatures. It is used in a variety of industries, including ceramics, glassmaking, and metalworking.
In conclusion, the correct answer to the question “A thick paste of cement, sand and water is called” is C. Mortar.