Problem: In Bushwick, an "up and coming" neighborhood in Brooklyn, New York, the local taqueria La Guadelupana, which prepared recipes from Puebla for Mexican working-class families, was suddenly faced with competition from El Mariachi Loco, a loud bar that marketed ironic mariachi-themed nachos and margaritas to the young, white professionals who were moving into the affordable neighborhood. Within two years, rents had increased, La Guadelupana had closed, and most of its patrons had moved. This is an example of a. sustainability. b. gentrification. c. environmental racism. d. built environments.