Answer:
kindness
Step-by-step explanation:
From the question, we are informed about Sasha who was a quarter short of what she needed to make her purchase in the lunch line. her friend slipped her the quarter so she could buy her lunch and eat. In this case, the aspect of personal development that her friend demonstrated was kindness.
Kindness can be regarded as a quality posses by someone which enables him/her to show generosity, this quality is needed for someone to be able to be friendly and be considerate in day to day activities