Introduction:
In the story "Dr. Heidegger's Experiment" by Nathaniel Hawthorne, Dr. Heidegger is a successful physician who has emerged successfully out of all the conflicts through his actions and choices. Among the given options, the correct answer is option 'D' - By saving a soldier's life as a sincere doctor and helping him to escape.

Explanation:
Dr. Heidegger, being a sincere and compassionate doctor, plays a pivotal role in the story by helping a soldier escape and saving his life. This act demonstrates his moral character and highlights his ability to navigate conflicts in a positive and ethical manner.

Key Points:
Here are the key points that explain why option 'D' is the correct answer:

1. Dr. Heidegger's profession: Dr. Heidegger is a physician known for his skills and medical knowledge. He has dedicated his life to the well-being of others and is respected in his community.

2. The soldier's predicament: During the story, a young soldier seeks refuge in Dr. Heidegger's house. The soldier is on the run and seeks help to escape the military conflict he is involved in.

3. Dr. Heidegger's empathy: Dr. Heidegger listens to the soldier's story and empathizes with his plight. He understands the soldier's fear and desperation, and recognizes the importance of helping him.

4. Planning the soldier's escape: Dr. Heidegger devises a plan to ensure the soldier's safe escape. He uses his knowledge and connections to arrange for the soldier's departure without arousing suspicion.

5. Risks and sacrifices: By aiding the soldier, Dr. Heidegger puts himself at risk. He may face consequences for aiding a fugitive, but his commitment to his duty as a doctor and his compassion for the soldier outweigh the potential dangers.

6. Success and resolution: Dr. Heidegger's plan is successful, and the soldier is able to escape. This act of saving a life and helping someone in need showcases Dr. Heidegger's ability to emerge successfully out of conflicts through his moral actions.

Conclusion:
Dr. Heidegger's success in emerging from conflicts is attributed to his sincere dedication to his profession as a doctor and his compassionate nature. By saving the soldier's life and helping him escape, he demonstrates his moral character and the ability to navigate conflicts in an ethical and positive manner.