In Class Your Professor Shows You an MRI Scan of a Primate

In class your professor shows you an MRI scan of a primate brain.The professor points out the relatively large size of the olfactory bulb beneath the frontal lobe.This suggests to you that

A) this primate shows a derived trait for an enhanced sense of smell as this trait is not commonly observed in mammal species.
B) this is a species of anthropoid because it has an increased reliance on vision.
C) this primate must be a species of prosimian, as that suborder of primates still relies heavily on the sense of smell for many aspects of daily life.
D) none of the above.