Final answer:
Significant life events are rated as more stressful than flunking a class according to the College Undergraduate Stress Scale.
Step-by-step explanation:
According to the College Undergraduate Stress Scale, significant life events such as the loss of a loved one or major personal injury or illness are rated as more stressful than academic issues, including flunking a class. The scale takes into account a variety of factors that can contribute to a student's stress levels, acknowledging that while academic challenges like exams, grades, and absenteeism are certainly impactful, personal and external pressures can have an even more profound effect on overall student well-being.