occurs when one has fewer interpersonal relationships than desired, or when relationships are less satisfying than desired.

A) Shyness
B) Moodiness
C) Loneliness
D) Depression

Loneliness occurs when an individual feels disconnected from others or lacks the social connections they desire. Shyness refers to feelings of discomfort or nervousness in social situations, but it does not necessarily indicate a lack of relationships. Moodiness is a state of frequently changing emotions and does not necessarily relate to social connections. Depression is a mood disorder that can involve feelings of loneliness, but it is not solely defined by this symptom.