One Disadvantage of Using the Internet as an Advertising Medium

One disadvantage of using the Internet as an advertising medium is

A) as a relatively new medium, it has attracted limited use.
B) online ads don't always result in a "click," but increase the likelihood of an action that leads to seeking more information about or purchasing of a product.
C) pay-per-click search ads on Google are expensive and ineffective.
D) it is difficult to translate messages that can be used in social media networks such as Facebook and Twitter.
E) it often creates more traffic than a firm can actually handle.