Jennie feels sad all the time now. She has not enjoyed anything for months. Jennie is probably suffering from:

a a phobia
b clinical depression
c obsessive-compulsive disorder
d grief

b clinical depression

Jennie's persistent feelings of sadness and lack of enjoyment in activities she used to enjoy for months are indicative of clinical depression. Clinical depression, or major depressive disorder, is characterized by a significant and persistent low mood and loss of interest in activities, affecting one's thoughts, behavior, feelings, and sense of well-being.

The other options do not seem to fit her described symptoms:
a) A phobia is an anxiety disorder characterized by an excessive and irrational fear of a specific object, situation, or activity.
c) Obsessive-compulsive disorder (OCD) is characterized by uncontrollable, reoccurring thoughts (obsessions) and behaviors (compulsions) that the individual feels the urge to repeat.
d) Grief is a natural response to loss and typically includes a wide range of emotional states but is usually associated with specific events or losses and does not necessarily lead to a persistently depressed mood unless it develops into a more complex form like persistent complex bereavement disorder.

It is important for Jennie to seek professional help from a healthcare provider or a mental health specialist for an accurate diagnosis and appropriate treatment.