The trend in excess bank reserves in the US​ is: A. Banks historically kept a minimum amount of excess reserves but then

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The trend in excess bank reserves in the US​ is:
A.
Banks historically kept a minimum amount of excess reserves butthen started piling up excess reserves after the 2008 financialcrisis
B.
​Historically, excess bank reserves is closely tied to how fastthe economy is growing and they share a similar trend as GDP
C.
​Historically, excess reserves are closely tied to the interestrates and increase as the interest rates fall
D.
Banks historically kepts a cushion of excess reserves but thenin the 2008 crisis this wiped those out and now they keep muchlower levels of excess reserves