The sense of smell is closely linked to:

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

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

Or it could be

http://health.howstuffworks.com/mental-health/human-nature/perception/smell3.htm

Check your book.

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

The sense of smell is closely linked to C. memories and emotions.

To arrive at this answer, you can use your prior knowledge or consult reliable sources such as textbooks or scientific articles. However, let me explain why smell is closely linked to memories and emotions.

The olfactory system, responsible for our sense of smell, is closely connected to our brain's limbic system, which is involved in emotions and memory formation. When we smell something, the information is processed in the olfactory bulb, which is directly connected to the amygdala and hippocampus, both of which play important roles in emotions and memory.

This close connection between the olfactory system and the limbic system is why smells often evoke strong emotional responses or trigger vivid memories. For example, the aroma of freshly baked cookies might evoke feelings of comfort and happiness because it may remind us of previous positive experiences or childhood memories associated with such smells.

In contrast, if we associate a particular smell with a negative experience, such as the smell of a certain food that made us sick, we may feel disgust or aversion whenever we encounter that smell again.

Therefore, the sense of smell is closely linked to our memories and emotions, making option C the correct answer.