The european union established a called the euro.
a. pop culture competition
b. common currency
c. homogenous culture
d. common language

The correct answer is B.

The European Union established a currency union, characterized by the usage of a common currency, the euro. From this moment on, the countries which adopted the euro gave up the control of their monetary policy, which since 1999 is managed by the European Central Bank.

National goverments are only entitled to use fiscal policy mechanisms to influence on their economic growth and debt figures.

they have different colored collars

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.