Final answer:
David is in the reintegrating stage of Schaie's theory of adult thinking, as he is applying his cognitive and professional skills towards volunteer work for the community, signalling a move towards more personal and social responsibilities.
Step-by-step explanation:
David's application of his cognitive skills, as a defense lawyer who decides to volunteer his services to battered women, reflects the reintegrating stage of adult thinking according to Schaie. This stage of development involves the reorganization of one's life and cognitive skills around meaningful pursuits that are independent of earlier life roles such as career and child-rearing. It is associated with making choices and commitments to personal, social, and civic responsibilities.