Final answer:
Decreased variability and late decelerations in FHR are signs of possible fetal distress in a woman in labor, differentiating from normal labor signs, which include regular and powerful contractions leading to cervical dilation.
Step-by-step explanation:
The question seeks to identify signs and symptoms of a woman in labor with an un-reassuring fetal heart rate (FHR). Among the provided options, the correct answer is the one indicating that signs of concern would include decreased variability and late decelerations in FHR, which are indicators of possible fetal distress. True labor is defined by regular, powerful contractions that lead to progressive cervical dilation and do not abate with hydration or rest. During this physiological process, the uterine contractions stretch the cervix, promoting dilation and effacement. Thereby, labor progresses through a positive feedback loop, with the increase of oxytocin secretion enhancing uterine contractions further. However, an un-reassuring FHR characterized by decreased variability and late decelerations requires medical attention.