Which sentence from the first paragraph of “the meaning of the flag” introduces the main focus of the text? a. i know of nothing more difficult than to render an adequate tribute to the emblem of our nation. b. for those of us who have shared that nation’s life and felt the beat of its pulse it must be considered a matter of impossibility to express the great things which that emblem embodies. c. i venture to say that a great many things are said about the flag which very few people stop to analyze. d. it has been created by the experience of a great people, and nothing is written upon it that has not been written by their life.