Which of the following was a belief held by karl marx? a. a factory owner's only responsibility to his workers is to pay fair wages b. socialism is a new and revolutionary idea that no one has tried before c. all of history has been a struggle between classes of people d. individual owners should control most businesses in a country

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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.