Answer: The correct answer is "market segment".
Explanation: When consumers respond in a similar way to a given set of marketing efforts, they can be referred to as a market segment.
The definition of market segment refers to a homogeneous and large group of consumers that can be recognized within a market, who have similar desires, buying habits, and who will react similarly to the power of marketing.
Therefore, when they react similarly to a given set of marketing efforts, they can be called a market segment.