What was james watt's contribution to the industrial movement? he built the first railroad locomotive. he designed a riverboat that traveled a distance of 150 miles. he made the steam engine more efficient. his innovation made water power essential for mills.

Sometimes people say that James Watt invented the steam engine. Well, this is not quite true, because a number of people had produced steam engines of sorts. 
James Watts took the steam engine design of a man named Thomas Newcomen and made it much more efficient.

This was James Watt´s major contribution to the Industrial Revolution

Ithink the answer is b, monopoly