Final answer:
According to Maslow's hierarchy of needs, Madeline's need for belongingness and love is not being fulfilled, leading to her feeling depressed and lonely.
Step-by-step explanation:
According to Maslow's hierarchy of needs, the category of needs that has not been fulfilled for Madeline is Belongingness and love needs (Option C). These needs refer to the desire for interpersonal connections and social relationships. Madeline's feelings of being excluded from group activities and social events indicate that her need for belongingness and love is not being met, which has led to her feeling depressed and lonely.