Groups of customers are asked for feedback about products over a period of time.

• A. Focus groups
• B. Consumer Panels
• C. Market research
• D. Surveys

Answer: (B)

This item is about tracking feedback from customers over time using a fixed group. A consumer panel is a selected group of consumers who agree to provide information at multiple points, so their responses can show how attitudes, preferences, and buying behavior change as products and markets evolve. That time-based, repeated-input setup is what makes a panel the best fit for collecting ongoing feedback from the same people rather than a one-off snapshot.

Focus groups provide in-depth opinions from a small group in a single session, so they don’t give the longitudinal data needed here. Surveys can be used within panels, but the key idea is the repeated participation of the same respondents over time, which distinguishes panels from generic survey approaches. Market research is the broader field, encompassing many methods, but the description points to the specific approach of using a consumer panel.