Concept:The cigarette filter traps nicotine particles on its surface through adsorption.
Explanation:The filter is made of a porous material, such as cellulose acetate.
As smoke passes through it, nicotine particles collide with and stick to the filter's surface.
This surface attachment is called adsorption.
Adsorption involves particles adhering to the outer surface of a solid.
It is different from absorption, where a substance is taken into the bulk or interior of another material.
Burning and evaporation do not describe how a filter removes nicotine.
Therefore, the filter reduces nicotine by adsorption.
Answer:A. adsorption