One Disadvantage of Using the Internet as an Advertising Medium

One disadvantage of using the Internet as an advertising medium is that

A) as a relatively new medium, it has attracted limited use.
B) it is difficult to translate messages that can be used in social media networks such as Facebook and Twitter.
C) it can be complicated with many search, display, and payment options.
D) it often creates more traffic than a firm can actually handle.
E) pay-per-click search ads on Google are expensive and ineffective.