The Labor Nurse Would Not Encourage a Mother to Bear

The labor nurse would not encourage a mother to bear down until the cervix is completely dilated, to prevent which of the following?
Note: Credit will be given only if all correct choices and no incorrect choices are selected.

A) Maternal exhaustion
B) Cervical edema
C) Tearing and bruising of the cervix
D) Enhanced perineal thinning
E) Having to perform an episiotomy