Final answer:
One true statement about social identities is that people want to see their group as distinct from and better than other groups. Additionally, people can have multiple social identities and some people may not develop social identities. Social identities can be based on groups of various sizes. option a.
Step-by-step explanation:
One true statement about social identities is that people want to see their group as distinct from and better than other groups. This desire to view one's own group as superior is known as in-group bias. Additionally, it is not true that people usually have only one social identity; individuals have multiple social identities based on different aspects of their lives such as ethnicity, religion, nationality, and more. While some people may develop social identities, others may not. Lastly, social identities can be based on groups of various sizes, not necessarily small enough for most members to know each other.