​Functional Magnetic Resonance Imaging (FMRI)measures Brain Activity by What Means

​Functional magnetic resonance imaging (fMRI) measures brain activity by what means?

A) It compares the amount of radiation emitted by cells in various brain areas.
B) ​It compares the electrical activity to the magnetic activity within each brain area.
C) It compares the electrical activity of a brain area to the volume of the area.​
D) It compares the amount of oxygen attached to hemoglobin in various brain areas.​

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