Naomi, a psychologist, conducts two sessions a week for patients who are addicted to alcohol, whereby they share their experiences with each other. these sessions are collectively termed as

 these sessions are collectively termed as  group therapy.
Group therapy refers to A form of therapy that is conducted in small group of people who held similar problems rather than doing it individually.
This type of therapy only efficient if the effect of disorder is relatively the same in all people (such as alcohol addicts or drug addicts)

The correct answer is "the protesters were attacked by chinese troops and many were killed or arrested."