The question asks about the exposure sources of benzene pollution.

Option 1: Automobile Exhaust, Tobacco Smoke, and Wood Burning - This is the correct answer. Benzene is a component of gasoline and is a by-product of certain industrial processes, so it can be present in automobile exhaust. Tobacco smoke also contains benzene. Additionally, burning wood can release benzene.

Option 2: Tobacco Smoke and Using Varnished Wooden Furniture - While it`s correct that benzene is in tobacco smoke, it`s not typically found in varnished wooden furniture, as benzene is not used in the varnishing process.

Option 3: Automobile Exhaust, Wood Burning, and Using Varnished Wooden Furniture - Although it`s correct that automobile exhaust and wood burning can release benzene, as mentioned earlier, using varnished wooden furniture is not a common exposure source for benzene.

Option 4: All mentioned - Although benzene can indeed be found in automobile exhaust, tobacco smoke, and the burning of wood, it`s not typically present in varnished wooden furniture or in products made of polyurethane.

Specify more if the student is still curious about the other two items - varnished wooden furniture and products made of polyurethane. However