In this scene, George confesses to Slim and tells him everything he has done to Lennie. Steinbeck answers the essential question by showing George's guilt and that he is now trustworthy. This scene demonstrates trustworthiness because George is trusting Slim to keep him secrets and not tell anyone. The author wants us to understand that friendship without trust isn't really friendship.
In this scene, George threw Lennie's mouse away from him. Steinbeck demonstrates being respecful and caring by showing us that George cares for Lennie and doesn't want him playing with a dead mouse because he can get sick. The author wants us to understand that friendship is about caring for the other person even when they don't want it.
In this scene, Curley's wife is yelling at Crooks and Candy is protecting him. Steinbeck answers the essential question by showing us that Candy has empathy for Crooks because he understands the danger that Crooks is in if Curley's wife accuses him of something negative and that he isn't being treated fairly by Curley's wife. The author wants us to understand that friendship can help someone out that is in a bad situation.