Carls Jr. came out with a new hamburger and released it in two different cities with two different price points. Marketers at Carls Jr. then analyzed the different levels of purchase made at the two different price points, planning on using the information to help them set a nationwide price for the new offering. This is an example of ________.
A) observational research
B) behavioral research
C) qualitative research
D) experimental research
E) survey research
Answer: D