Final answer:
The synonym for 'mincingly' in the context of the provided excerpt from 'To Build a Fire' is D) Daintily, illustrating the dog's cautious movement.
Step-by-step explanation:
In the excerpt from part 2 of "To Build a Fire," the best synonym for the underlined word mincingly is D) Daintily. This description provides imagery of the dog's cautious and tentative movements, emphasizing the animal's suspicion and careful manner.