The correct answer is B. Limestone.
Explanation
Limestone is a natural material formed mainly by Calcium Carbonate, it is one of nature's most abundant compounds, and its mineral form is called Calcite. The various forms of calcium carbonate has numerous applications in the industry. Limestone is used as a building material, in the manufacture of glass, in metallurgy as a flux, and to obtain lime and calcium cyanamide. Marble serves as an ornamental element in the building and for statuary. Additionally, the pearls are composed of calcium carbonate, deposited by oysters, clams, etc. So, the correct answer is B. Limestone.
