Which of the following is a potential drawback of using Web-based technologies for making sales presentations and servicing accounts?
选项：

A: Web-based technologies lower the overall efficiency of salespeople.
B: The cost of the technology outweighs the advantages gained through eliminating travel.
C: Web-based technologies can intimidate salespeople or clients who are unfamiliar with them.
D: Salespeople who use web-based technologies tend to be less attentive to customer needs.
E: Online selling usually takes more time than direct selling.