![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Rationing by long lines is
A.
inefficient, because it wastes buyers' time.
B.
efficient, because those who are willing to wait the longest get the goods.
C.
the only way scarce goods can be rationed.
D.
only necessary if price ceilings are not binding.