The correct answer is (c), Solid Carbon Dioxide.
Dry ice is the solid form of carbon dioxide. It is used in a variety of applications, including refrigeration, cryotherapy, and theatrical effects. Dry ice is non-toxic and non-flammable, but it can be dangerous if it is not handled properly. It can cause suffocation if it is inhaled, and it can cause burns if it comes into contact with skin.
Liquid nitrogen is a colorless, odorless, and non-flammable liquid that is used in a variety of applications, including cryogenics, rocket propulsion, and superconductivity. Liquid nitrogen is very cold, and it can cause severe burns if it comes into contact with skin.
Water ice is the solid form of water. It is a common substance that is found in nature, and it is used in a variety of applications, including drinking, cooking, and cleaning. Water ice is not dangerous to handle, but it can be slippery if it is on the ground.
Frozen ethanol is the solid form of ethanol. It is a colorless, flammable liquid that is used in a variety of applications, including fuel, solvents, and antiseptics. Frozen ethanol is dangerous to handle, and it can cause burns if it comes into contact with skin.