Answer:
You can make the passive in a subordinate clause that has a subject and a normal conjugated verb. This is really the same as a normal passive. Active: I thought that Mary had kissed John. Passive: I thought that John had been kissed by Mary.
Explanation:
I believe that the correct answer is D because it is already stated once that they need the sirens so it is giving us a fact that has already been stated.
On his face, because the director what’s to see the mans emotion which leads to the expirations
I believe the answer would be the second option, this is because the text states that amazonencore has been publishing since 2009, which eliminates the other choices (the first uses the word 'now' claiming they 'now' publish books, the second is not stated in the passage, so it isnt important. The last option claims amazon went through 'conflicts' but it did not, in fact the kindle is an amazon product) If you have any questions, dont hesitate to ask! I hope this helped!
I say its C. correct me if I'm wrong