Question 9 (1 point) What changes led to economic decline and social unrest in early 19th century China?

Question 9 options:

Rapid industrialization and imperialism

Multiple dynasty changes and widespread famine

Declining population and policies of isolationism

Rising population and interference from foreign powers

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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