Deposits from cigarette smoke interfere with the normal functioning of cilia in the:
a) trachea
b) esophagus
c) bronchioles
d) pharynx

The answer to you question is very simple, Trachea, because a trachea is a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe.

Therefore you answer is,

Trachea.

I hope that this has satisfied you, and if not then feel free to ask questions.

I would prefer to use two different tutoring methods because the two students are struggling with two different things. The C students is struggling with the class and doesn't turn in the homework which lowers his grade while the other student has a disibility and doesn't understand the work. The student with the disibility struggles with understanding what is required of the homework assignments while the C student is being unprepared for class not turning the assignments in.

Explanation:

Im so sorry if im wrong!