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You assist to deliver a full term baby boy who is otherwise normal but has a left cleft of the upper lip that extends upward toward the left nostril and left anterior cleft of the primary palate just deep to the cleft lip. These defects are most likely due to a failure of which of the following?

AMandibular process to fuse with the lateral nasal process
BMandibular process to fuse with the medial nasal process
CMaxillary process to fuse the lateral nasal process
DMaxillary process to fuse the medial nasal process (Correct Answer)