Which best describes the costs of world war 1 millions of soliders and civilians died and the economies of europe were ruined millions of soliders died but civilians were spared few civilians died but the economies of europe were ruined millions of people died but the economies of warring nations remained healthy

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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