Answer: a. They feel comfortable with and loyal to each other.
Step-by-step explanation:
In sociology and social psychology, an in-group is a social gathering of people to which each individual declares membership. That membership usually relates to their race, culture, gender, age, or religion, depending on what each person finds meaningful in their view of themselves. In-groups are an essential fount of belonging and self-esteem because they provide a sense of social identity.