Measuring electrical activity of the brain over time is done using B. EEGs. Thus, option "B" is correct.
EEG: The term EEG is also referred to as an electroencephalogram which is defined as a particular test that detects the electrical activities in an individual's brain through small metal discs i.e, electrodes that are being attached to his or her scalp.
Thus, option "B" is correct.
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