Whenever Alyssa rode her bike past her friend’s house after…

Whenever Alyssa rode her bike past her friend’s house after school, her friend’s mother, Melody, always greeted her with freshly baked pie. When Melody became busy remodeling her home, she stopped meeting Alyssa outside with pie when Alyssa rode by on her bike. Alyssa no longer rides her bike by her friend’s house anymore.  This is an example of: