NO.PZ2020021601000010
问题如下：
Ivan Paulinic, an analyst at a large wealth management firm, meets with his supervisor to discuss adding financial institution equity securities to client portfolios.
Paulinic gathers data on three national banks that meet initial selection criteria but require further review. This information is shown in Exhibits 2, 3, and 4.
Based only on Exhibit 2, which of the following statements is correct?
选项：
A.The quality of earnings for R- bank was the highest in 2009.
B.Relative to the other banks, N- bank has the highest quality of earnings in 2017.
C.Trading represented a sustainable revenue source for T- bank between 2005 and 2013.
解释：
B is correct.
The quality of earnings is directly related to the level of sustainable sources of income. Trading income tends to be volatile and not necessarily sustainable. Higher- quality income would be net interest income and fee- based service income. Because N- bank’s 2017 trading revenue contribution is the lowest relative to other banks, its quality of earnings would be considered the best of the three banks.
这道题的解题思路麻烦解释一下，看了解析，不明白为什么最低的就是质量最好的
