**Core Concept**
Shoulder dystocia is a complication of vaginal delivery where the anterior shoulder of the infant becomes impacted against the maternal pubic symphysis, preventing the delivery of the rest of the baby. This occurs due to a combination of factors including fetal macrosomia, cephalopelvic disproportion, and abnormal labor patterns.

**Why the Correct Answer is Right**
The McRoberts maneuver is the first-line management of shoulder dystocia. It involves hyperflexion of the mother's legs tightly to her abdomen to widen the pelvis and facilitate the delivery of the baby's shoulder. This maneuver works by increasing the pelvic outlet dimensions, reducing the angle of the pelvic inlet, and improving the alignment of the fetal shoulder with the maternal pelvis. The McRoberts maneuver is effective in approximately 90% of cases of shoulder dystocia.

**Why Each Wrong Option is Incorrect**
**Option A:**
The suprapubic pressure technique involves applying downward pressure on the mother's abdomen just above the pubic symphysis to help dislodge the baby's shoulder. While it can be used in conjunction with the McRoberts maneuver, it is not the primary management strategy for shoulder dystocia.

**Option B:**
The Woods screw maneuver involves using a gloved hand to apply pressure to the anterior aspect of the baby's head while simultaneously applying traction to the baby's body to help dislodge the shoulder. This technique is typically used after the McRoberts maneuver has failed.

**Option C:**
The Rubin II maneuver involves using a gloved hand to apply pressure to the baby's posterior aspect of the head while simultaneously applying traction to the baby's body to help dislodge the shoulder. This technique is typically used after the McRoberts maneuver and the Woods screw maneuver have failed.

**Clinical Pearl / High-Yield Fact**
A key factor in preventing shoulder dystocia is identifying and managing fetal macrosomia. Fetal macrosomia is defined as a birth weight of 4000g or greater, and it is associated with an increased risk of shoulder dystocia.

**Correct Answer: D. McRoberts maneuver. The McRoberts maneuver involves hyperflexion of the mother's legs tightly to her abdomen to widen the pelvis and facilitate the delivery of the baby's shoulder.**