Answer:
State
Explanation:
The clients' case is a STATE CASE. This is because the clients or the plaintiffs and the defendants are in the same state. Since it has been established that the defendant is a local builder (Shoddy & Sons, is a local building company).
A State court is authorized to hear cases that deal with laws and citizens of the same state or locality while a Federal court is authorized to hear cases that deal with laws and citizens of different states.
On the other hand, concurrent jurisdiction involved a situation where parties to the disputes are from different states but due to the nature of their cause of disputes, such as breach of contract done in a particular state. Party A can sue Party B in either of the federal or state courts.