At a Hallmark store you can find several different product lines of greeting cards, likely including Fresh Ink, Nature's Sketchbook, Shoebox, Maxine, Mahogany, and Tree of Life cards—all made by Hallmark for sale in its stores and intended to appeal to different target markets. The Mahogany line is designed to appeal to African-Americans. This is an example of segmentation.

It is an example of demographic segmentation.

Explanation:

To start with, demographics is the study of a population (especially a human population) on the basis of factors that include race, age, gender, households, families, ethnicity,education, income e.t.c.

Thus, demographic segmentation is a market segmentation based on factors that include race, age, gender, households, families, ethnicity, education, income e.t.c.

This kind of segmentation helps an organization or business like Hallmark store (from the question) to accurately target its customers and effectively satisfy their needs.

b is the correct answer