Answer:
D) Great care was taken to keep the truth from the public.
Step-by-step explanation:
The way the supply van and ambulance personnel approached the monkey house support that statement: most of them were not wearing a uniform, and they did not enter through the main door but parked behind the building which “presented a brick face, some narrow windows, and a glass door.” All of this indicates that they did not want to be recognized, and instead, wanted to prevent people from seeing what was really going on. We can summarize, then, that the central idea of this paragraph is that “great care was taken to keep the truth from the public.”