Which two methods can a reader use to identify the main idea of a text

Which sentence correctly uses a normative case pronoun

Considering "civil disobedience," why did both thoreau and martin luther king, jr. engage in acts of civil disobedience? to take a stand against government taxation to protest government policies they believed were unjust to protest slavery and the mexican-american war to take a stand against unfair laws in the 1950s and ‘60s

Which of the following is an example of a periodical?