Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
Refer to the figure below.
-The cells lining your respiratory tract are typically ciliated and have a columnar shape (they are taller than they are wide) .Which structure(s) shown in the figure contribute(s) most to the cilia and maintaining this shape of the cells?

A) 1 and 2 only
B) 2 only
C) 2 and 3 only
D) 1,2,and 3
E) 2,3,and 4