To solve this problem, we need to identify the device that can remove particulate matter from the exhaust of a thermal power plant. Let's analyze each option:$\newline \bullet$Option 1: STP (Sewage Treatment Plant) - This is used for treating sewage and wastewater, not for removing particulate matter from exhaust gases.$\newline \bullet$Option 2: Incinerator - This device is used for burning waste materials, not specifically for removing particulate matter from exhaust gases.$\newline \bullet$Option 3: Electrostatic Precipitator - This device is specifically designed to remove particulate matter from exhaust gases by using electrostatic forces. It is highly effective in capturing fine particles from industrial emissions.$\newline \bullet$Option 4: Catalytic Converter - This device is used in vehicles to reduce harmful emissions by converting pollutants into less harmful substances, but it is not primarily used for removing particulate matter from exhaust gases.$\newline$Based on the analysis, the correct device for removing particulate matter from the exhaust of a thermal power plant is the Electrostatic Precipitator.$\newline$Therefore, the correct option is Option 3.