Analyze the relationship between 'eurozone' and 'euro' within the context of the input sentence.
Options: original broadcaster, distributed by, position held, currency

Predictions of a close result were proved badly wrong from the start of counting on Sunday night with around 60 per cent of Greek voters ignoring warnings about their country's membership of the euro and backing the 'No' campaign against five years of unpopular economic reforms imposed by Greece's eurozone creditors.
currency