This is considered foreshadowing and one of the important developments of the plot was introduced when Slim's dog had puppies CarIson killed Candy's dog Slim asks George to be on his work crew Crooks enters the bunkhouse

## Step 1<br />The problem is asking us to identify a significant plot development in the novel "Of Mice and Men" by John Steinbeck. The options provided are all events that occur in the novel, but we need to identify which one is considered foreshadowing and is a significant plot development.<br /><br />## Step 2<br />Foreshadowing is a literary device where the author gives clues or hints about future events in the story. In this case, the event that is considered foreshadowing and is a significant plot development is when Carlson kills Candy's dog.<br /><br />## Step 3<br />This event is significant because it mirrors the fate of Lennie, who is also a mentally disabled character. The way Candy's dog is killed is a foreshadowing of how Lennie will be dealt with in the future.<br /><br />## Step 4<br />This event is also significant because it shows the harsh reality of the world the characters live in, where the weak are often eliminated. This is a reflection of the themes of the novel, which include the harsh realities of life and the consequences of power and authority.