Italy, Greece and Spain, hit hard in Europe's sovereign-debt crisis a decade ago, are once again running big budget deficits. Like President Biden, their leaders plan to spend on a grand scale to revamp their economies, betting that ambitious investments can give a lasting boost to growth. These countries could be saddled with some of the world's highest debt ratios if the gamble doesn't work, potentially destabilizing the eurozone. But if the return to big borrowing pays off, it will strengthen calls for a European fiscal union.The "Eurpean fiscal union" refers to __________. Group of answer choices the centralization of taxing and spending authority across the eurozone the centralization of monetary authority across the eurozone the centralization of central banks across the eurozone