You Have Just Joined a Psychology Lab and Are Working

You have just joined a psychology lab and are working with a group of researchers who are interested in how the brain responds to different kinds of facial expressions (e.g. happy, scared, angry, etc.) . They ask you if you have any ideas for experiments. You suggest that knowing whether the overall electrical activity of the brain changes immediately after processing happy or scared faces might tell you something about how the brain perceives emotion. If you hypothesize that the electrical response of the brain may vary across different kinds of facial expressions, what method would be appropriate to test that hypothesis?

A) ERP (event-related potentials)
B) a computerized axial tomography (CT) scan
C) transcranial magnetic stimulation (TMS)
D) None of these method would be appropriate to test that hypothesis.
E) A functional MRI (fMRI)