A

In the Universal (ADA) numbering system, the permanent dentition is numbered sequentially from the upper right third molar (1) across to the upper left third molar (16), then down to the lower left third molar (17) and across to the lower right third molar (32); the layout shown (1-16 on the maxilla, 32-17 on the mandible) matches this pattern exactly [Al-Johany, 2016, PMID 27872549].