Answer:
The correct answer would be, Copy Testing or Pre Testing.
Explanation:
Copy Testing or Pre Testing is a specialized research method of marketing which determines the effectiveness of the marketing plan like advertisement, promotion, etc, by recording the consumer's responses, feedback and behaviors.
So in this question when an ad agency recruit consumers to come watch a TV series and commercials between them, and then ask them questions about those ads, they are basically recording the consumer's response and behaviors and feedback of the consumers about the advertisement they formulated. This means they are practicing Copy Testing or Pre Testing.