Why Have Direct-Response Television Commercials Seen an Increase in Popularity

Why have direct-response television commercials seen an increase in popularity in recent years?

A) It is has become simpler to replicate the success of classic direct-response TV ads that introduced items such as the Veg-O-Matic.
B) Traditional broadcast and cable advertising has become prohibitively expensive for many major corporations.
C) The ability to track phone calls and website hits makes it easy to measure the return on advertising investment.
D) The sophisticated image of home shopping channels has given direct-response commercials more credibility.
E) Consumers are more likely to respond to this type of marketing than to other forms of direct marketing.