Which scenario would be the most problematic, considering the limited usage of the euro?

A.) A German family tries to purchase snacks at a French grocery store.

B.) A German family attempts to pay for postcards at a French Souvenir shop.

C.) A Danish family attempts to pay for their meal at an Italian restaurant in Sicily.

D.) An Italian family attempts to purchase tickets for a tour of a German zoo.

The most problematic scenario considering the limited usage of the euro would be:

C.) A Danish family attempts to pay for their meal at an Italian restaurant in Sicily.

This is because Denmark is not part of the Eurozone and does not use the euro as its currency. They would need to exchange their Danish kroner into euros in order to pay for the meal, which can be inconvenient and potentially expensive due to currency exchange fees.