Read the excerpt from The Call of the Wild. There was nothing for the dogs to do, save the hauling in of meat now and again that Thornton killed, and Buck spent long hours musing by the fire.

How does the event affect the development of the plot?

It shows that Thornton needs Buck in order to hunt for food.
It reveals that Buck is bored and his mind starts to wander.
It suggests that Thornton will begin to find activities for Buck.
It proves that Buck is enthusiastic about looking for the mine.