Juanita buys diet Dr. Pepper at Dollar General. She typically pays $1.99 per bottle. Walmart is selling the same size of Dr. Pepper for $1.25 per bottle. While Juanita's Dollar General can lower its price to $1.25, it has no control over what Walmart's price will be. Walmart can lower its price, keep its price unchanged, or raise its price. This scenario is referred to as _______. a. A/B test b. focus group research c. naturalistic observation d. conjoint studies