**Core Concept**
The underlying principle being tested is the management of a primigravida in the second stage of labor with a vertex presentation, adequate pelvis, and late decelerations on fetal heart monitoring. This scenario requires understanding of **obstetric management** and **fetal well-being**.

**Why the Correct Answer is Right**
Given the information, the most appropriate management would involve expediting delivery to minimize fetal distress, as indicated by late decelerations. Since the pelvis is adequate and the station is +2, **instrumental delivery** or **assisted vaginal delivery** could be considered to shorten the second stage of labor.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is not provided, but typically, options that suggest delaying delivery or not intervening would be incorrect given the presence of late decelerations.
**Option B:** Similarly, without the specific option, we can infer that any choice not aimed at expediting delivery would be inappropriate.
**Option C:** This might involve more invasive procedures or not addressing the urgent need to deliver the baby.
**Option D:** Without specifics, we can assume that any option not prioritizing immediate delivery would be wrong.

**Clinical Pearl / High-Yield Fact**
Late decelerations on fetal heart monitoring are a sign of **uteroplacental insufficiency** and indicate that the fetus is not tolerating labor well. Prompt action, such as assisted vaginal delivery, is often necessary to prevent further fetal distress.

**Correct Answer:** D. Assisted vaginal delivery