A 32-year-old G2P1 woman presents for a routine first-trimester ultrasound at 11+3 weeks of gestation. The scan reveals two gestational sacs, each containing a live fetus with appropriate crown-rump length. The structure marked **C** in the diagram is noted to be thick (>2 mm) and inserts into the placenta with a triangular projection of placental tissue visible at the insertion point. Which of the following best describes the significance of this finding for antenatal management?
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