문제 내용: 밑줄 친 부분 중 글의 흐름상 가장 어색한 것은?
선택지 1: Aware of their protected status, banks made excessively risky bets on housing markets and invented ever more complicated derivatives.
선택지 2: New virtual currencies such as bitcoin and ethereum have radically changed our understanding of how money can and should work.
선택지 3: The result was the worst financial crisis since the breakdown of our economy in 1929.
선택지 4: In the years since 2007, we have made great progress in addressing the too-big-to-fail dilemma. Our banks are better capitalized than ever. Our regulators conduct regular stress tests of large institutions.