David Is a Market Researcher Who Has Just Been Hired

Multiple Choice

David is a market researcher who has just been hired by a toothpaste manufacturer to determine what the dental profession thinks about their new whitening toothpaste. David has a list of dentists that he obtained last year from a past client. Should David use that list he would be:

A) too survey oriented in his approach.
B) neglecting the rights of the respondent.
C) improving his efficiency.
D) maintaining research integrity.