Final answer:
Bella may be diagnosed as having major depression (c) if her symptoms persist for more than two weeks. Bella Swan's persistent symptoms suggest she may be diagnosed with major depression, which is a mood disorder requiring treatment beyond just temporary interventions.
Step-by-step explanation:
The symptoms described in the question are consistent with major depression (c). Major depression is a mood disorder characterized by persistent sadness, loss of interest or pleasure, changes in appetite and sleep patterns, feelings of worthlessness or guilt, difficulty concentrating, and thoughts of death or suic_ide. It is a serious condition that can significantly impact a person's daily functioning and quality of life. If these symptoms last for more than two weeks, it is important for Bella to seek professional help for a proper diagnosis and appropriate treatment.