Which description of Francis Lowell is correct?

He hired young women to work in his Massachusetts textile mill, provided housing, and paid them a fair wage.

He patented a method of making muskets on an assembly line with interchangeable parts.

He designed a water-powered spinning frame based on an English model that gave rise to America's textile industry.

He made slavery profitable in the South by inventing a simple machine that removed seeds from cotton.

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.