An Auto Scaling group scales up and down based on Average CPU Utilization. The alarm is set to trigger a scaling event when the Average CPU Utilization exceeds 80% for 5 minutes. Currently, the Average CPU has been 95% for over two hours and new instances are not being added.
What could be the issue?

A. A scheduled scaling action has not been defined.
B. In the field Suspend Process, “ReplacesUnhealthy” has been selected.
C. The maximum size of the Auto Scaling group is below or at the current group size.
D. The Health Check Grace Period is set to less than 300 seconds.