The best statement that summarizes the character of Spot, based on the excerpt from "That Spot" by Jack London, is:
Spot refused to work and stole food from everyone.
This statement captures both Spot's refusal to contribute to the work of the sled dog team and his cleverness as a thief who raided food supplies. The other options either misinterpret Spot's role in the team or do not provide a comprehensive summary of his character.