Final answer:
In scenes 4 & 5, three things that convicted Hauptman are: witness testimonies, fingerprints on the ransom money, and handwriting analysis.
Step-by-step explanation:
In scenes 4 & 5, three things that convicted Hauptman are:
Witness testimonies: Witnesses testified against Hauptman, linking him to the crime and providing evidence of his involvement.
Fingerprints: Hauptman's fingerprints were found on the ransom money, which further tied him to the crime.
Handwriting analysis: The ransom notes were compared to Hauptman's handwriting, and experts concluded that he was the author of the notes.