In this unit, you read about different historical leaders of the later Mediterranean and Middle Eastern civilizations. Identify one leader you learned about who you think was a good leader in his or her respective civilization. I severely need help because I have to have this done before 12 am somebody please help me with an answer

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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