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RNThe correct answer is **C. Early deceleration**.
### Rationale
Early decelerations are characterized by a gradual decrease in the fetal heart rate (FHR) that coincides with the peak of the contraction. The most defining feature is that the FHR returns to the baseline **at the same time** the contraction ends.
* **Physiological Cause:** These are typically caused by **fetal head compression** during a contraction, which triggers a vagal response.
* **The "Mirror" Effect:** Early decelerations are often described as "mirroring" the contraction; as the contraction pressure goes up, the heart rate goes down, and as the pressure subsides, the heart rate returns.
* **Clinical Significance:** These are considered **benign (Category I)** and do not require medical intervention, though the nurse should continue to monitor the labor progress.
### Why the other options are incorrect:
* **A. Late deceleration:** These begin *after* the contraction has started and the nadir (lowest point) occurs after the peak of the contraction. They return to baseline after the contraction is over and indicate uteroplacental insufficiency.
* **B. Moderate variability:** This refers to the normal fluctuations in the FHR baseline (6–25 bpm) and describes the "jaggedness" of the line rather than a specific drop related to a contraction.
* **D. Marked variability:** This is when the fluctuations in the baseline are greater than 25 bpm, which can indicate acute hypoxia or fetal stimulation.
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