Please help i don’t know the 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 a. primary sources are historical documents, and secondary sources are modern-day documents.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.

Brainliesttt !me : -how do the international monetary fund and group of 8 encourage economic growth and limit abuse?

What is an example of a primary source? o a. a dictionary entry o b. a history book o c. an encyclopedia article o d. a recording of a speech