Final Answer:
If men and women respond similarly to the same marketing mix, they do not constitute different segments. Gender would not be effective in this example because the segment is not differentiable.
Step-by-step explanation:
In marketing segmentation, the key criterion is the ability to differentiate segments based on their responses to the marketing mix. If men and women respond similarly, it implies that gender is not a distinguishing factor, making it not differentiable as a segment. This aligns with the concept that effective segmentation should allow for distinct groups with varying responses, enabling targeted marketing strategies.
Therefore, option E (differentiable) is the correct answer in this context. It accurately reflects the idea that if there is no discernible difference in responses between men and women, gender does not serve as an effective basis for segmentation.