Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: The shock resignation of the Greek finance minister in the wake of the country's historic referendum ‘no’ vote left European stock markets weak today. The FTSE 100 index of leading shares in London fell 50.1 points or 0.76 per cent to 6,535.7 by the close, while the Frankfurt and Paris leading indices were down 1.1 and 1.7 per cent respectively. But market volatility was not as bad as many in the City had feared after Yanis Varoufakis sensationally quit following the country's overwhelming vote to reject the austerity terms demanded by international creditors. Trustnet Direct analyst Tony Cross said: 'Yesterday's referendum saw the electorate squarely refute the idea of buying into creditor demand and by all accounts this is paving the way for Greece to exit the eurozone, but so far the reaction has been rather less dramatic than many had been expecting.'FTSE 100 index of leading shares in London down 0.8 per cent as stock prices fall less than fearedGerman and French leading indices both down 1.1-1.7 per centYanis Varoufakis sensationally quit following referendum vote to reject austerityGreece central bank will ask ECB to save nation's financial system 
 Question:If banks open on Tuesday, without _ providing sufficient liquidity, they will be drained of cash by midday!’.

ECB