Of Vivian Callaway's Problems in Finding a New Dessert Product

of Vivian Callaway's problems in finding a new dessert product was that consumers often say one thing in a market research study,then behave differently in an actual supermarket setting.To overcome this problem,Callaway and her team did a lot of "iterative experimentation" in the marketplace.This strategy involved

A) interviewing only those customers who were leaving the supermarket with a RTE dessert product.
B) interviewing only those customers who were leaving the supermarket without an RTE dessert.
C) conducting market research on desserts in shopping malls so customers didn't know which dessert was being studied, thereby reducing bias.
D) offering customers two samples of the identical product to cull out respondents who couldn't give an accurate assessment.
E) putting a prototype product in the store, making changes based upon consumer responses, and then repeating the process.