These are the 5 fast-food chains that teens love the most

The restaurant industry is increasingly competitive — and tapping into the next generation is crucial for chains' survival.  Failing to capture millennials' interest has led to slumping sales and restaurant closures at sit-down chains such as Applebee's. However, according to Piper Jaffray's biannual survey of teen preferences, some casual-dining chains may be staging a comeback. Despite millennials' adoration of quick-service chains like McDonald's, Starbucks, and Chipotle, some...