It's true because the author tries to teach the reader something
Since they are using sounds and words to express themselves, it'll be Verbal Communication.
Whatever the union army ventures, part of their job , now, it's to protect the freedom of the former slaves . so it makes abolition and aim of the civil war .which it had not been up to the issuing of the proclamation .
The reason that Thomas Paine brings up the opposing argument that the colonies have been well protected by the British is:
B. To create a chance to prove his opponents wrong
Thomas Paine states in “The American Crisis, No.1" about the importance of Independence for the people of America. He approaches every people through emotional thoughts and ideas. His writings persuade people to think over the need for Independence of themselves and for their children. Thomas Paine didn’t agree with the fact that Great Britain has always benefited the colonies and will ever benefit them in the future. He opposes the fact that it will provide security and protection to the colonized countries.