If the labor period lasts only for 3 hours, the nurse should suspect that the following conditions may occur:
1. Laceration of cervix
2. Laceration of perineum
3. Cranial hematoma in the fetus
4. Fetal anoxia
A 2,3,4
B 2 & 4
C 1,2,3,4
D 1 & 2