PLEASE HELP. What do you think Malcolm X meant when he said, " Today it's time to stop singing and start swinging ... Cassius Clay can sing. But singing didn't help him to become the heavyweight champion of the world . Swinging helped him."

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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