Explanation:

- Courts often consider a joint trial when cases share commonalities, making proceedings more efficient.

- Option 1: A common question of law or fact can lead to a joint trial to avoid inconsistent judgments.

- Option 2: When the relief sought pertains to the same transaction, combining cases can streamline the process.

- Option 3: If the right to relief arises from a series of transactions, a joint trial can provide clarity and coherence.

- Option 4: All of the above options are valid reasons for a court to order a joint trial, as they all contribute to judicial efficiency and consistency.