What 2015 event saw banks closed for three weeks and capital controls imposed, with a referendum on bailout terms?

• A Asian financial crisis
• B Cyprus haircut
• C Grexit crisis ✓
• D Argentine default

The summer 2015 'Grexit' crisis peaked when Prime Minister Tsipras called a referendum rejecting creditors' terms, leading to bank closures, capital controls, and a third bailout agreement.