Final answer:
Option (C), The brain research technique that monitors the brain's utilization of glucose is called Positron Emission Tomography (PET), which involves using a mildly radioactive tracer to map brain activity.
Step-by-step explanation:
The brain research technique that involves monitoring the brain's usage of glucose is called Positron Emission Tomography (PET). In a PET scan, a mildly radioactive tracer is injected or consumed by an individual, which then allows for the monitoring of glucose or other metabolites in the brain. This technique shows which areas of the brain are more active as they will use more glucose and thus more blood will flow to that area.
The movement of the tracer through the blood in the brain is tracked by a computer to create a map indicating active and inactive areas during a behavior. Although PET scans are less detailed than functional magnetic resonance imaging (fMRI) and can't pinpoint events precisely in time, they remain a useful tool for assessing brain function.