Which sentence is written in active voice? A.
The police have arrested the thieves.
B.
The thieves were arrested by the police.
C. The thieves were put under arrest by the police.

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.

pretty sure 1.someone's coat was found in the lobby.