Janelle is into running. As soon as she gets home from work at the hospital, she changes into her running clothes, puts on her high-quality running shoes, and goes outside to run. When her schedule permits it, Janelle participates in 5K runs to raise money for children's charities. She has met many friends who are also involved in running. The running groups that Janelle is involved with are examples of _______. a. income segmentation b. benefit segmentation c. geodemographic segmentation d. lifestyle segmentation