The most common cause of decreased variability in the FHR that lasts 20 minutes or less is:

Choice A rationale
Quickening, the first fetal movements felt by the mother, typically occurs between 16 and 20 weeks of gestation, so she should expect to feel fluttering sensations within the next month.
Choice B rationale
At 15 weeks of gestation, it is too early for most first-time mothers to feel fetal movements. Quickening usually occurs between 16 and 20 weeks, so she has not missed the window.
Choice C rationale
While some fetal movements may be subtle, it is inaccurate to suggest that some babies are entirely quiet. Quickening is generally felt by most mothers between 16 and 20 weeks.
Choice D rationale
The baby is indeed moving, but fetal movements are usually not felt until 16 to 20 weeks of gestation in first-time pregnancies, so it is normal not to feel them yet at 15 weeks.

Choice A rationale
Hypertension is not a common side effect of epidural blocks; instead, hypotension is more likely due to vasodilation. Monitoring for hypertension is not the most important intervention.
Choice B rationale
Bradycardia is a potential side effect of epidural blocks due to sympathetic blockade. Monitoring the maternal pulse for bradycardia ensures timely intervention if this side effect occurs.
Choice C rationale
Epidural blocks do not typically cause fetal tachycardia. Monitoring the fetus for tachycardia is not the primary nursing intervention following epidural administration.
Choice D rationale
Limiting parenteral fluids is not advised after an epidural block as fluids are essential to counteract potential hypotension. Fluid management is crucial to maintain maternal and fetal hemodynamics.