Which of the Following Accurately Summarizes the Research on Brain

Which of the following accurately summarizes the research on brain activity and the placebo effect?

A) Placebo treatments, unlike active treatments, do not change brain activity.
B) Placebo and active treatments both change brain activity, but they change different brain regions.
C) Placebo and active treatments are associated with similar changes in brain activity.
D) Placebo effects are subjective, and thus cannot be investigated with brain imaging.