The correct answer is B. Limestone, Clay and Gypsum.
Cement is a binding agent that is used to hold together aggregates (sand and gravel) to form concrete. It is made by heating limestone and clay to a high temperature, which causes them to react and form a clinker. The clinker is then ground into a powder and mixed with gypsum to form cement.
Limestone is a sedimentary rock that is composed of calcium carbonate. It is the main ingredient in cement, and it provides the calcium and silicon that are necessary for the formation of cementitious compounds.
Clay is a fine-grained sedimentary rock that is composed of minerals such as kaolinite, illite, and montmorillonite. It provides the aluminum and silica that are necessary for the formation of
cementitious compounds.Gypsum is a mineral that is composed of calcium sulfate dihydrate. It is added to cement to control the setting time of the cement.
The chemical composition of cement can vary depending on the type of cement and the source of the raw materials. However, the basic composition of all cements is the same: limestone, clay, and gypsum.