The correct option is 1, 2, and 3 only, as these sources are commonly associated with benzene pollution. Benzene is a volatile organic compound (VOC) released into the environment primarily from automobile exhaust, which contributes significantly to air pollution, as well as from tobacco smoke and wood burning, both of which can release hazardous emissions into indoor and outdoor air. In contrast, while varnished furniture and polyurethane products may emit other VOCs, they are not major sources of benzene specifically. This knowledge is critical for understanding environmental health risks and regulatory measures in air quality management, a key aspect of UPSC syllabus in the context of environmental science and public health.