In a situation where the plaintiff sues two defendants for a car crash, can one defendant sue the other for an unrelated state contract claim?

In the context of joinder and supplemental jurisdiction, the correct choice indicates that one defendant cannot sue the other for an unrelated state contract claim in the same lawsuit involving a car crash. This is because for claims to be joined in a single case, they must arise out of the same transaction or occurrence or be related in some way, which is commonly referred to as "transactionally related."

In this scenario, the car crash constitutes a specific event that is entirely separate from the unrelated state contract claim. Therefore, the claims do not meet the required standard of being transactionally related, which is essential for the court to allow the other defendant to bring a claim against one of the parties involved.

The options relating to agreements between defendants or court permission do not alter the fundamental requirement of transactional relatedness that governs whether claims may be joined in the same litigation. This emphasizes the importance of establishing a clear legal connection between the claims to proceed within the same context.