Which invention, significantly refined by James Watt in the late 18th century, became a primary power source for factories, trains, and ships, profoundly shaping the Industrial Revolution?

💡 Explanation:

The steam engine, dramatically improved by James Watt in the late 18th century, transformed industry and transportation by providing a powerful and versatile energy source, thus becoming central to the Industrial Revolution. The other options represent later or different technological advancements.