【单选题】Had enough elevator music? Make way for elevator advertising and, for that matter, advertising in mall food courts, offices, hotel lobbies and at grocery store checkout counters: A growing number of m...
A.
It refers to such outdoor advertising as elevator advertising and billboards.
B.
It is now less expensive and time-consuming than the traditional media.
C.
It benefits a lot from technology advances.
D.
It will become more and more popular as an advertising outlet.