What made nonviolent protest effective during the Montgomery Bus boycott?

Ineed to have answers for numbers 2-4 reply to this question

Which of the following scenarios illustrates the cultural impact of expanded regional trade for postclassical civilizations? o a. the byzantine empire rises in place of the roman empire. o b. an islamic scholar attends a university in his hometown. o c. internal disputes weaken a large african empire. o d. an arabian sultan wears a robe made from chinese silk.

Which of the following best describes how the maya civilization was governed