Final answer:
The author's conversation with the Lutheran minister relates to various aspects of farming except for selling land if the yield is poor.
Step-by-step explanation:
The author's conversation with the Lutheran minister relates to all points except option C: Selling a few acres of land is fine if the yield is poor. The conversation discusses the moral character of family farmers, the divine gifts associated with farming, the duty to ensure productive land, and the autonomy of farmers who convert wasted land. However, the conversation does not mention anything about selling land if the yield is poor.