Answer:
The correct answer is letter "A": Age of population.
Step-by-step explanation:
Demographic segmentation allows companies to classify customers based on age, gender, and income so firms can adapt their efforts according to their target consumers. By this, companies are more likely to provide a specialized product generating commitment in their market sector.
Thus, in the example, if there is need to conduct a demographic segmentation for a clothing manufacturer, out of the options given, consumers' age is more important to consider since it will allow the firm to know if the product should be focused on children, teenagers or adults clothing.