Which of the following events in Robert Frost's life significantly shaped his philosophy of "the sound of sense", where he advocated for the use of everyday language and speech rhythms in poetry?
1
His upbringing in rural New England and interactions with local communities.
2
His friendship with British poet Edward Thomas during his time in England.
3
His deep admiration for the transcendentalist writings of Ralph Waldo Emerson.
4
His alignment with the modernist movement in poetry led by Ezra Pound.