[Solved] The single biggest weakness of personal selling is that it: A) is the most costly way to communicate with prospects. B) is not a one-on-one medium of communicating with customers. C) prevents sales representatives from observing customers' nonverbal signs. D) does not allow representatives to demonstrate products live. E) is the most ineffective way of developing customer databases. Donnerstein: null Sexual Orientation: null Erotic Preference: null Emotional Preference: null