Based on __________, the Campbell Soup Co. changed the labels of most of its soup cans.
-online/e-mail questionnaires
-social media Facebook comments and Twitter tweets analysis
-internal secondary data, sales reports on soup sales by flavor and package type (can or microwave bowl)
-neuromarketing studies
-external secondary data, an article in the Journal of Consumer Behavior on ethnographic research
Answer: neuromarketing studies