He means mischief is the thoughts f a desperate man he thinks bad things because he is a impatient person
The answer is c because the subject is the topic of the story pretty much like if I where to write something about myself I would be the subject and let's say the theme is about bravery and I have to deal with that so yeah C
Yes because the police are trained to do their job and even though some people are against the police they are trained and not everyone is a good person.
It would cause the reader to think that too. and it could confuse the reader if the assumption is contradicted later on in the story.
hope i helped!