(A) Berne
Mazzini founded 'Young Europe' in Berne, whose members were like-minded young men from Poland, France, Italy and the German states.
Source: Nationalism in Europe, Section 2.4 – The Revolutionaries
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The passage clearly states Mazzini founded two societies: Young Italy in Marseilles, and Young Europe in Berne. Students often confuse the two locations — remember: Italy → Marseilles, Europe → Berne.