The fact that roses have a distinctive and similar fragrance regardless of where they are found is explained by the fact that
a. they produce molecules of similar shape that match the olfactory receptors.
b. the airborne molecules activate the vestibulary receptors for the floral fragrances.
c. they produce similar numbers of gaseous molecules.
d. the floral smell of roses is one of the four primary scents.
ANSWER: a
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