When Roberto decided to try a new soft drink brand due to the unavailability of his favorite, what type of problem-solving is illustrated?

The situation described illustrates limited problem solving. Limited problem solving occurs when a consumer faces a situation that requires a decision but does not warrant extensive research or consideration due to familiarity with the product category. In this case, Roberto is switching to a new soft drink brand because his favorite is unavailable. He likely has some level of familiarity with soft drinks and is capable of making a quick decision, but he is not invested enough in the choice to engage in extensive research or consideration.

This contrasts with routine problem solving, where a consumer automatically chooses a product they frequently buy without much thought, or extensive problem solving, which involves a significant amount of research and deliberation typically undertaken for expensive or unfamiliar products. Impulse buying, on the other hand, is characterized by spontaneous decisions without prior planning. Therefore, the scenario fits best with limited problem solving.