The court should dismiss the entire case for lack of complete diversity. The court should dismiss the claim between B and C because there is no diversity between them. If A now wishes to file a claim against C, he may do so by invoking supplemental jurisdiction concepts. A sues B in federal court, and B moves to dismiss for improper service of process. The court denies the motion.
B then moves to dismiss for lack of personal jurisdiction.
The court will rule on B's motion by looking at concepts of sovereignty, minimum contacts, long arm statutes and the like. If the claim arose in Georgia, the case may not be filed in Florida's federal courts. A may file such an action in federal court, but not in any Georgia state court. In cases in which the federal courts have exclusive jurisdiction over a matter, the plaintiff may file his claim in either federal court or a state court which has personal jurisdiction over the defendant. A sues B, and B moves to dismiss for improper service of process.