The correct answer is B. Filtration.
Precipitation is the process of a substance being dissolved in a solution and then coming out of solution as a solid. Electrophoresis is the movement of charged particles in an electric field. Sedimentation is the process of particles settling out of a liquid due to gravity.
Filtration is the process of removing particles from a liquid or gas by passing it through a porous material. The pores in the filter are small enough to trap the particles, while the liquid or gas passes through. This is the most common method for removing carbon particles from air.
The other options are not as effective for removing carbon particles from air. Precipitation can be used to remove carbon particles, but it is not as efficient as filtration. Electrophoresis can be used to remove carbon particles, but it is a
more complex and expensive process. Sedimentation can be used to remove carbon particles, but it is a slow process and it can only be used to remove particles that are large enough to settle out of the air.