I don't know how to do this, please help me, thank you

Harvey's came out with a new hamburger and released it in two different cities with two different price points. Marketers at Harvey's then analyzed the sales results at the two different price points. This information was used to help them set a nationwide price for the new offering. This is an example of a. experimental research O b. behavioral research O c. qualitative research O d. survey research O e. observational research