The correct answer is: A. petrol
Denatured spirit is ethanol mixed with a substance that makes it poisonous to drink. This is done to prevent people from drinking it and getting alcohol poisoning. Petrol is a common substance that is used to denature spirit. It is a flammable liquid that is made from petroleum. It is used as a fuel in cars and other engines.
Kerosene is another substance that is sometimes used to denature spirit. It is a flammable liquid that is made from petroleum. It is used as a fuel in lamps and heaters.
Water is not a substance that is used to denature spirit. It is a colorless, odorless, and tasteless liquid that is essential for life. It is made up of hydrogen and oxygen atoms.
Pyridine is a colorless, flammable liquid that is made up of carbon, hydrogen, and nitrogen atoms. It is used in the manufacture of pesticides and pharmaceuticals.
Denatured spirit is a dangerous substance that should be handled with care. It should not be consumed or inhaled. It should be stored in a safe place away from children and pets.