Which of the following might best express the main idea of this passage? [origin

Lots of people pretend that they never read advertisements, but this claim may be seriously doubted. It is hardly possible not to read advertisements these days. And what fun they often are, too! Just think what a railway station or a news paper would be like without advertisements. Would you like to read only closely-printed columns of news in your daily pa per? A cheerful, witty advertisement makes such a difference to a drab wall or a newspaper full of the daily ration of calamities.
     We must not forget, either, that advertising makes a positive contribution to our pockets. Newspapers, commercial radio and television companies could not subsist without this source of revenue. The fact that we pay so little for our daily paper, or can enjoy so many broadcast programs is due entirely to the money spent by advertisers. Just think what a newspaper would cost if we had to pay its full price !
     Another thing we mustn’t forget is the "small ads" , which are in virtually every newspaper and magazine. What a tremendously useful service they perform for the community ! Just about anything can be accomplished through these columns.  For instance, you can find a job, buy or sell a house, announce a birth, marriage or death in what used to be called the "hatch, match and dispatch" columns, but by far the most fascinating section or "agony" column. No other item in a newspaper provides such entertaining reading or offers such a deep insight into human nature.