A newborn baby is noted to have a left unilateral cleft lip. There are no abnormalities of the baby's palate. Which of the following developmental defects accounts for this occurrence?
A
Failure of the left lateral palatine process to fuse with the median palatine process
B
Failure of the left maxillary prominence to unite with the left medial nasal prominence
C
Failure of the primary palate to fuse with the secondary palate
D
Failure of the right and left medial nasal prominences to merge