What can result from a successful challenge to joinder?

A successful challenge to joinder typically leads to the removal of the joined party from the case. When a party’s joinder is deemed improper, for instance, because it does not meet the necessary requirements such as subject matter jurisdiction or the connection to the other claims or parties in the case, the court may order that the joined party be dismissed. This ensures that the proceedings remain focused and adhere to the rules governing proper joinder, which aim to promote judicial efficiency and fairness in the adjudication of related claims.

In the context of the other options, they do not accurately reflect the consequences of a successful challenge to joinder. Dismissal of the entire case would be disproportionate unless the joined party’s presence was essential to a valid claim. Hearing all claims together is contrary to the purpose of the joinder challenge, as it implies acceptance of the joined party's presence. Lastly, allowing only some claims to proceed may occur in other contexts but does not directly stem from challenging the joinder itself. The focus is specifically on party removal when joinder challenges are affirmed.