Final answer:
Donna is likely in Schaie's executive stage, as she is addressing real-world problems and considering the impact of decisions on others and her day care center.
Step-by-step explanation:
Based on Schaie's stages of cognitive development and the scenario involving Donna, she is most likely in the executive stage. The executive stage is characterized by a concern for the welfare of others and broader society as a whole, as well as a focus on dealing with real-world problems and the practical applications of intellect. In Donna's case, the day care center she runs has grown successfully, implying that she has already gone through the previous achieving stage, where the focus would have been on achievement and the advancement of her career. Now, she is considering the needs of others and the impact of her decisions on her staff and the day care center's future.