When Bruce Teilhaber opened his men's shoe store, he decided to carry a full line of shoes in the larger, hard-to-find sizes. Today, his shoe store caters to professional basketball, baseball, and football players who appreciate the variety and quality of shoes Tielhaber carries and often order a dozen new pairs in a single visit. This shoe store uses:
A. market aggregation.
B. undifferentiated marketing.
C. concentrated marketing.
D. market atomization.
E. demographic segmentation.
Answer: C