The answers provided to you should be:
A) “‘There are eighty of you in the car,’ the German officer added. ‘If anyone goes missing, you will all be shot, like dogs.’”
B) “On the first day of the journey, she had already begun to moan. She kept asking why she had been separated from her family.”
C) “When they came back, they told us that they had learned, in exchange for a gold watch, that this was the final destination.”
D) “But there was nothing outside but darkness. We returned to our places, shame in our souls but fear gnawing at us nevertheless.”
The answer is A because he is saying he will hunt them down and shoot them as if they were a wild animal, specifically a dog.
D. "this was an uneasy secret..."
This is a sentence fragment, it has no subject so it is an incomplete sentence.
The correct answer for E2020 is letter A) The words convey a sense of steady motion
I would say A because it sounds correct if you say t out loud. If you say it with b or c it doesn't sound as normal.