When V8,a Brand of Vegetable Juice,wanted to Determine If Viewers

When V8,a brand of vegetable juice,wanted to determine if viewers understood the health benefit message they were trying to convey in their television commercial,they conducted research in which consumers were brought to a research centre to view a pilot television show in which the V8 ad they were testing appeared.Several other ads appeared during the 30-minute television program,and after viewing the show,participants were given a survey regarding their attitudes towards all of the ads they had seen.Unbeknownst to them,five different groups saw the same program and ads,except the V8 ad was different for each group.V8 was trying to determine the relative effectiveness of various approaches to the sales message.What type of research is this?

A) Secondary
B) Concept testing
C) Semiotic research
D) Copy testing
E) Content analysis