Final answer:
The thematic archetype for the story is 'man against insurmountable odds', where a poor man fights against a corporation to save his farm.
Step-by-step explanation:
The thematic archetype that fits the story of a poor man from the country traveling to the city to stop a corporation from taking his farm to build a new subdivision is D. man against insurmountable odds.
This theme is characterized by an individual standing up against a much more powerful adversary or force, which in this case is the large corporation. The man's struggle is emblematic of an individual's fight to preserve their rights and livelihood against the overwhelming power of corporate interests.