Positron Emission Tomography (PET)scans Work by

Positron emission tomography (PET) scans work by

A) measuring the reflection of a narrow X-ray beam as it passes through the brain.
B) tracing the amount of glucose used in different parts of the brain.
C) measuring the signals emitted by the brain when placed in a strong magnetic field.
D) destroying parts of the brain to observe the effects on behavior.
E) using mild electrical currents to observe the effects of stimulating parts of the brain.