B  

In Miller’s system, a Class II recession is one that extends to or beyond the mucogingival junction while the interdental papillae and bone remain intact; classes III–IV show interdental loss, and Class I stops coronal to the mucogingival junction. The prompt implies recession without interdental attachment loss, so it fits Class II rather than I, III, or IV [Miller, 1985 rev 2018, PMID 30188152].