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.What does this suggest?

A) This primate exhibits a derived trait for an enhanced sense of smell,since this trait is not commonly observed in mammal species.
B) This primate is a species of haplorhine because it has an increased reliance on vision.
C) This primate must be a species of strepsirhine,as that suborder of primates relies heavily on the sense of smell for many aspects of daily life.
D) The species of this primate must be nocturnal.