Since its inception the euro has brought about revolutionary changes in European finance. For example,

Multiple Choice

a$.$ by redenominating corporate bonds and stocks from several different currencies into one common currency, the euro has precipitated the emergence of continent$-$wide capital markets in Europe that are comparable to U$.$S$.$ markets in depth and liquidity.

Sb$.$ wiss bank accounts are all denominated in euro.

c$.$the European banking sector has become much more important as a source of financing for European firms.

d$.$ there have actually not been any revolutionary changes.