问题如下：
At times, large dealer banks have financed
significant fractions of their assets using short-term (often overnight)
repurchase agreements in which creditors held bank securities as collateral
against default losses. The table below shows the quarter-end financing of four
broker-dealer financial instruments. All values are in USD billions.
In the event that repo creditors become equally nervous about each bank’s solvency, which bank is most vulnerable to a liquidity crisis?
选项：
A. Bank A
B. Bank B
C. Bank C
D. Bank D
解释：
考点：对The Failure Mechanics of Dealer Banks的理解
答案： 选项B正确。
解析：
Not pledged assets在Financial
instruments owned里的占比越高代表在Liquidity crisis时越安全，相反，如果Not pledged assets在Financial instruments
owned里的占比越低，则代表越Vulnerable。因为B银行的占比最低，因此在Liquidity crisis时，他是Most vulnerable。
这题没看明白，题目的意思是 bank lend money to dealer bank A，B，C，D吗？这四家用的repo？那么collateal越大 越安全？
