David Participated in a Study Done by an Advertising Agency

David participated in a study done by an advertising agency.During his interview,he was asked to gauge the services provided by a regional airline on the basis of his experiences and what others had told him.The interviewer asked David specific questions about the food,the seating arrangements,the ease with which he entered and exited the plane,and the service provided by the airplane attendants.Since the ad agency doing the research is the one that will be the creative strategy for the airline's new ad campaign,you know that David most likely provided the agency with:

A) product/service specific preplanning inputs
B) general product inputs to be stored and used later
C) secondary external data
D) quantitative data which will be used by the client to determine market development strategies