Which of the Following Is True About Penfield's Investigations of Brain

Which of the following is true about Penfield's investigations of brain function in brain surgery patients?

A) The patients remained awake during electrical stimulation of their brains.
B) Penfield failed to demonstrate any links between cortical site and brain function.
C) Penfield observed that patients would experience profound emotions when the frontal lobe was stimulated.
D) These procedures would be considered unethical today because of the pain involved with brain stimulation.