A plaintiff files suit in federal court based solely on diversity jurisdiction. The defendant moves to dismiss for lack of subject matter jurisdiction, arguing the amount in controversy does not exceed $75,000. Who bears the burden of proof on this issue?
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A
The defendant, as the moving party
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B
The plaintiff, as the party invoking federal jurisdiction
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C
Neither party; the court determines jurisdiction sua sponte
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D
The party challenging jurisdiction always bears the burden