How do paragraphs 17 and 18 of "Wangari Maathai's Nobel Lecture" mainly help develop the central idea?

How can a person be self justified he or she is proceeding in legal ways

How would having more railroad tracks be advantageous during a war

Which best describes the purpose of the south carolina exposition and protest, which was written by john c. calhoun? a) to explain why the south was nullifying the tariff of 1828 b) to describe the ways the tariff of 1828 would southerners c) to persuade northern states to rebel against the federal government d) to ask england for if the south decided to secede from the union