Which situation would be the BEST description of scarcity?
A
The stock market crash in 1929.
The gasoline shortage in the 1970s.
Climate change's impact on the sea level
The construction of infrastructure during Roosevelt's New Deal

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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