Which 1973 British parliamentary act, by joining the European Economic Community, abruptly ended New Zealand's preferential access to its largest export market?

• A Commonwealth Immigrants Act
• B Statute of Westminster
• C European Communities Act 1972 ✓
• D Single European Act

Britain's entry into the EEC on 1 January 1973 dismantled the imperial preference system that had guaranteed New Zealand butter, cheese, and lamb a protected market, forcing a painful economic restructuring.