Why did Preston Brooks attack Charles Sumner with a cane on the Senate floor?

a) Sumner has insulted Brooks’s elderly uncle in a vitriolic speech against proslavery advocates.

b) Brooks mistakenly believed that Sumner had spread a malicious rumor about his wife.

c) Sumner has suggested that abolitionists such as Brooks were thieves and hypocrites.

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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