They can protect you when an intruder breaks in your house
Thoreau, an important Transcendentalist, believes that people need to live an honest life. This can be applied to McCandless because he lived a few years of his life with nearly nothing. He disposed of all of his possessions because he simply thought they were unimportant in life.
I hope this helps you.
D. To convince the colonists to fight for independence.
The barber. barbers can do their own barber work, so i'm guessing he/she would do it themself