This seems to be a declarative sentence. It talks about the reaction of the policeman to a specific thing. His expression is not pleasant. What he might saw is something not good and something to worry about. Other possible thing could be there an heinous crime scene that he faced at that moment. It depends on the situation.<span />
To expose unfair judging practices at a contest
I'm so sorry if this isin't the answer, please don't attack me!
The correct answer is D- A narrative tells a story, while expository writing contains only fact-based information.