The correct answer is C. Titanium.
Ilmenite is an iron titanium oxide mineral with the chemical formula FeTiO3. It is the most important ore of titanium. Ilmenite is a black ore that is often found in sand or clay. It is a common mineral in igneous and metamorphic rocks. Ilmenite is also found in some sedimentary rocks.
Titanium is a chemical element with the symbol Ti and atomic number 22. It is a lustrous, silvery-white transition metal that is highly resistant to corrosion. Titanium is the fourth most abundant element in the Earth’s crust, after oxygen, silicon, and aluminum. It is also the ninth most abundant element in the universe by mass.
Titanium is used in a wide variety of applications, including aerospace, automotive, medical, and industrial applications. It is used in aircraft and spacecraft because it is strong and lightweight. It is also used in cars and other vehicles because it is corrosion-resistant. Titanium is used in medical implants because it is biocompatible. It is also used in industrial applications, such as in the production of chemicals and plastics.
Titanium is a valuable metal that is used in a wide variety of applications. Ilmenite is the most important ore of titanium.