The correct answer is C. Lead.
Galena is a lead sulfide mineral with the chemical formula PbS. It is the most important ore of lead, and is also a source of silver. Galena is a black, lead-gray, or silver-white mineral with a metallic luster. It is typically cubic or octahedral in habit, and often forms massive or disseminated aggregates. Galena is a common mineral in many types of rocks, including igneous, metamorphic, and sedimentary rocks. It is also found in some hydrothermal veins.
Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) on Earth, forming much of Earth’s outer and inner core. It is the fourth most common element in the Earth’s crust. It is a ferromagnetic element, and is one of the elemental metals that make up a large proportion of the Earth’s core and mantle.
Gold is a chemical element with the symbol Au and atomic number 79. It is a dense, soft, yellow, malleable and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native) form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with
the native element silver (as electrum) and also naturally alloyed with copper and palladium. Less commonly, it occurs in minerals as gold compounds, such as calaverite, chrysocolle, and chrysocolla.Calcium is a chemical element with the symbol Ca and atomic number 20. It is a soft, alkaline earth metal that is the fifth most abundant element in the
Earth’s crust. Calcium is a member of group 2 of the periodic table and is a alkaline earth metal. It is a silvery-white metal that is soft enough to be cut with a knife. Calcium is the fifth most abundant element in the Earth’s crust, after oxygen, silicon, aluminum, and iron. It is also the most abundant metal in the Earth’s crust. Calcium is found in many different minerals, including limestone, dolomite, and gypsum. It is also found in bones and teeth.