The correct answer is C. Alum.
Cement is a binding agent that is used to hold together other materials, such as concrete, mortar, and plaster. It is made from a mixture of limestone, clay, sand, and iron ore. These materials are ground into a fine powder and then heated to a high temperature. The resulting mixture is then ground again and mixed with water to form a paste. This paste can be used to create a variety of structures, from simple buildings to large dams.
Alum is a mineral that
is used in a variety of applications, including as a mordant in dyeing, as a clarifier in water treatment, and as an astringent in medicine. It is not a component of cement.Clay is a fine-grained mineral that is used in a variety of applications, including as a component of cement, as a filler in paper and plastics, and as a pottery material.
Alumina is a white, crystalline mineral that is used in
a variety of applications, including as an abrasive, as a component of ceramics, and as a catalyst.Gypsum is a mineral that is used in a variety of applications, including as a component of cement, as a plaster of paris, and as a fertilizer.