**Core Concept**
In a primigravida with a full-term pregnancy, labor complications may arise due to various factors such as prolonged labor, fetal distress, or maternal exhaustion. The clinical presentation of a non-reassuring fetal status, coupled with signs of maternal distress, necessitates prompt intervention to ensure both maternal and fetal well-being.

**Why the Correct Answer is Right**
In this scenario, the patient is experiencing a prolonged labor, as evidenced by the duration of labor and the presence of mild uterine contractions. The absence of fetal heart sounds and the presence of caput with moulding suggest fetal distress. The dirty, infected discharge may indicate chorioamnionitis, a condition that requires prompt treatment to prevent maternal sepsis and fetal morbidity. The best management option would involve immediate delivery, either via cesarean section or vaginal delivery, to expedite the resolution of fetal distress and prevent further complications.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may not be immediately apparent as incorrect, but in the context of a prolonged labor, performing an immediate cesarean section without assessing the fetal status or obtaining adequate anesthesia may not be the best course of action.

**Option B:** Administering oxytocin to augment labor may actually exacerbate the situation, as the uterus is already showing signs of fatigue and the patient is experiencing fetal distress.

**Option C:** Delaying delivery and continuing to monitor the patient may not be feasible, given the presence of fetal distress and the risk of maternal sepsis.

**Option D:** This option is incorrect as it does not address the underlying issue of fetal distress and prolonged labor.

**Clinical Pearl / High-Yield Fact**
In cases of prolonged labor, it is essential to perform a thorough assessment of the fetal status, including the presence of fetal heart sounds, and to consider the possibility of fetal distress or chorioamnionitis. Prompt delivery, either via cesarean section or vaginal delivery, is often the best management option to prevent further complications.

**Correct Answer: C. Immediate delivery via cesarean section or vaginal delivery is the best management option to expedite the resolution of fetal distress and prevent further complications.**