The correct option is A exhaust of a thermal power plant
The electrostatic precipitator removes over 99% of particulate matter present in the exhaust from a thermal power plant. It has electrode wires that are maintained at several thousand volts, which produce a corona of electrons. These electrons attach to dust particles giving them a net negative charge. The collecting plates are grounded and attract the charged dust particles.
The methods used to reduce pollution for other pollutants:
Exhaust from automobiles - catalytic converters
Industrial effluents - Waste water treatment
Kitchen waste - Composting