2. One of the most authoritative voices speaking to us today is, of course, teh voice of the advertisers. Its strident clamour dominates our lives. It shouts at us from the television screen and the radio loudspeakers; waves to us from every page of the newpaper; plucks at our sleeves on the escalator; signals to us from the roadside billboards all day and flashes messages to us in cloured lights all night. It has forced on us a whole new conception of the successful man as a man no less than 20%of whose mail consists of announcements of giant carpet sales.
1. According to the passage, modern advertising is "authoritative" because of the way it_______.
a. influences our image of the kind person we ought to be like
b. interferes with the privacy of home life
c. contunually forces us into buying things
d. distracts us no matter where we travel
The key is 'a'. But I just don't understand why.