Which of the following statements is true of the practice of trephination?
multiple choice
a. it involved drilling a small hole in a person's skull to release spirits or demons responsible for psychological disturbances.
b. it was a technique used by the church to distinguish good witchcraft from bad.
c. it involved tying a woman's hands and feet and throwing her into a lake or river to determine whether she was a witch.
d. it was used to make connections between a person's bodily organs and emotions.