The sense of smell is closely linked to:

Question

A. proper functioning of the auditory canal.
B. perceptual constancy.
C. memories and emotions.
D. the physiology of the taste buds.

Answer 1

http://www.jhu.edu/~jhumag/996web/taste.html

Answer 2

Or it could be
http://health.howstuffworks.com/mental-health/human-nature/perception/smell3.htm

Check your book.

Answer 3

I'm guessing C....My book talks about how smelling chocolate trigger fond memories of cozy winter mornings