An infant born to a mother who used retinoid-based anti-acne medications during early pregnancy, exhibits bilateral cleft lip. The most likely cause of the anomaly was retinoic acid-mediated reduction of mesenchymal proliferation in which of the following structures?
A. Lateral nasal process
B. Intermaxillary process
C. Mandibular Swellings
D. Second pharyngeal arch
E. Third pharyngeal arch

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