Final answer:
Reduction in internal uterine size can inhibit fetal descent and require further nursing interventions.
Step-by-step explanation:
The maternal factor that may inhibit fetal descent and require further nursing interventions is option c. Reduction in internal uterine size.
During labor, the uterus needs to contract and exert pressure on the baby to facilitate descent through the birth canal. However, if the internal uterine size is reduced, it can hinder the descent of the fetus. This can happen due to conditions such as a small pelvis, fibroids in the uterus, or abnormal fetal presentation.
Nursing interventions may include changing the maternal position, performing maneuvers like the McRoberts maneuver or using tools like forceps or vacuum extraction to assist with the delivery.