Final answer:
The Buccal Groove of the maxillary molar is used to assess the occlusion of Angle's classification, an important anatomic feature for determining molar relationships.
Step-by-step explanation:
The anatomic feature of the maxillary molar that is used to assess the occlusion of Angle's classification is the Buccal Groove (Option A). Edward Angle's classification of malocclusion is based on the relationship of the permanent first molars of the maxilla and mandible, and the buccal groove of the maxillary first molar is a critical landmark. The groove helps to determine the molar relationship, which is a key factor in identifying Class I, Class II, or Class III occlusions as defined by Angle's classification.