The Reason Why Particular Odours, Such as the Smell of Gardenias

The reason why particular odours, such as the smell of gardenias, often rekindle memories of important personal experiences might be because:

A) the smell areas of the human brain are more highly developed than the other sensory areas.
B) odours are processed in the cerebellum.
C) the thalamus gives priority processing to the sense of smell.
D) the olfactory bulb is directly connected to areas involved in emotion.