This piece of equipment removes small particles out of the cooled air before the air is sent to you in your mother's car.
a) filter
b) radiator
c) distillation apparatus
d) chromatography paper

Explanation:

An automobile air filter is often made of porous pleated paper. Many of them are cylindrical, as in the diagram below, but others have shapes that fit the available space in the engine compartment.

B) is wrong. A radiator is used to cool the car's engine.

C) and D) are wrong. You probably won't find a distillation apparatus or chromatography paper in your mother's car unless she is a chemist taking them somewhere else.

particle   p is an electron and particle q is a neutron