What is the best way to describe a group?

A$.$

A gathering of people who happen to be in the same place at the same time by coincidence.

B$.$

Any collection of two or more people who interact on a regular basis and share a sense of belonging and identity.

C$.$

A classification of people based on shared characteristics who are not personally connected in any other way.

D$.$

An organization where membership and advancement are based on merit and proven ability.