The correct answer is c) Thorium.
Monazite is a rare earth phosphate mineral that is found in beach sands and igneous rocks. It is an important source of thorium, a radioactive element that is used in nuclear power plants. Monazite also contains other rare earth elements, such as lanthanum, cerium, and praseodymium. These elements are used in a variety of applications, including electronics, magnets, and catalysts.
Iron is a common metal that is found in rocks and minerals. It is an important component of steel and other alloys. Manganese is a metal that is used in batteries, alloys, and other products. Uranium is a radioactive metal that is used in nuclear power plants.
Thorium is a radioactive metal that is used in nuclear power plants. It is a more abundant element than uranium and has a lower risk of proliferation. Thorium is also a more efficient fuel than uranium, meaning that it produces more energy per unit mass.
Monazite is a valuable mineral that is used in a variety of applications. It is an important source of thorium, a radioactive element that is used in nuclear power plants. Monazite also contains other rare earth elements, which are used in a variety of applications, including electronics, magnets, and catalysts.