![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
Mr. Schindler was admired for his courage to free those persecuted in ____ concentration camp knowing that he was ____.
A.
the so-called, sailing into choppy waters
B.
the political event known as the, treading waters
C.
what we call the, swimming over choppy water
D.
what was designated the, entering a highly debatable subject