The most complicated portion of the nasal cavity is its lateral walls because the upper half to two-thirds is formed by parts of the ethmoid bone and the lower part is formed by portions of the mandible.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct,but the reason is NOT correct.
D) The statement is NOT correct,but the reason is correct.
E) NEITHER the statement NOR the reason is correct.