The correct answer is D. All of the above.
Asbestos is a natural fibrous mineral substance that is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3). It also contains iron oxide and alumina. Asbestos is a very durable material that is resistant to heat, fire, and electricity. It has been used in a variety of products, including insulation, roofing, and fireproofing. However, asbestos is a known carcinogen and can cause serious health problems if it is inhaled. As a result, the use of asbestos has been banned in many countries.
Option A is correct because asbestos is a natural fibrous mineral substance. Option B is correct because asbestos is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3). Option C is correct because asbestos contains iron oxide and alumina. Therefore, the correct answer is D. All of the above.