The correct answer is c) Thorium.
Monazite is a rare-earth phosphate mineral with the chemical formula (Ce,La,Th,Nd,Y,Pr,Pb)PO4. It is a member of the monazite group of minerals, which also includes xenotime and lanthanite. Monazite is typically found in monazite-bearing sands, which are often associated with granites and pegmatites.
Monazite is an important source of thorium, a radioactive element that is used in nuclear power plants. It is also a source of rare earth elements, which are used in a variety of applications, including electronics, magnets, and batteries.
Iron is a common element that is found in rocks and minerals. It is the most abundant metal in the Earth’s crust. Iron is used in a variety of applications, including construction, manufacturing, and transportation.
Manganese is a common element that is found in rocks and minerals. It is the 12th most abundant element in the Earth’s crust. Manganese is used in a variety of applications, including batteries, steelmaking, and agriculture.
Uranium is a radioactive element that is found in rocks and minerals. It is the 92nd most abundant element in the Earth’s crust. Uranium is used in nuclear power plants and nuclear weapons.