Explanation:

- A group of people, typically with vehicles or animals, travelling together: This refers to a collection of people moving collectively, often over long distances, such as in the context of a journey or expedition.

- Option 1: Troop

- Usually refers to a group of soldiers or scouts.

- Not typically used for travelers with vehicles or animals.

- Option 2: Gang

- Often denotes a group involved in criminal activities.

- Not suitable for a group of travelers in the context provided.

- Option 3: Circus

- Typically refers to a company of performers, not travelers.

- Relates more to entertainment than travel.

- Option 4: Caravan

- Correct choice. Refers to a group of travelers journeying together, often involving vehicles or animals, such as camels.