Answer:
the two-way flow of communication between a buyer and a seller, designed to influence a person's or group's purchase decision.
Step-by-step explanation:
Personal sales is, in plain terms, where companies use individuals to market the commodity after interacting with the consumer eye to eye. The dealers embrace the commodity by their experience of attitude, presentation and professional service. They target at educating and motivating customers to purchase the drug, or at minimum to try it.
Thus, from the above we can conclude that the correct option is c.