Final answer:
A group in the sociological sense is defined as a collection of people who frequently interact and share a collective identity, making a high school chess club a fitting example.
Step-by-step explanation:
In the sociological sense, a group refers to a collection of at least two people who frequently interact and share a sense of identity aligned with the group. The best example from the provided options that fits this definition would be b. a high school chess club.
This is because members of a chess club are likely to interact regularly, share common interests and goals related to the game of chess, and see themselves as part of the chess community, which conveys a sense of group identity. On the other hand, a collection of sightseers, a gathering at a crime scene, or a line at the grocery store are more akin to aggregates or crowds, where the individuals present do not necessarily interact in a meaningful way or share an identity.