AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The primary human factor was the movement of skilled German printers to other countries, where they sought work and helped establish new printing presses across Europe.
The passage explicitly states: "Printers from Germany travelled to other countries, seeking work and helping start new presses." Examiners want this specific point — it was skilled human migration/labour, not just the technology spreading on its own. Mention "German printers" and "travelled/migrated" for full credit.