Explanation:

- A group of worshippers is a collection of individuals gathered for the purpose of religious worship or a service.

- Option 1: Posse - A posse is typically a group of people, often armed, summoned by a sheriff to enforce the law or to capture a criminal.

- Option 2: Caravan - A caravan refers to a group of people, especially traders or pilgrims, traveling together across a desert or through remote areas, often with vehicles or animals.

- Option 3: Constellation - A constellation is a recognized pattern of stars in the night sky, not related to groups of people.

- Option 4: Congregation - A congregation is a group of people assembled for religious worship. It perfectly defines a group of worshippers.

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