Final answer:
Baltes' compensation strategy involves focusing on the most important goal at a given time to effectively use personal resources for development across the life course.
Step-by-step explanation:
The compensation strategy suggested by Baltes and his colleagues as part of the selective optimization with compensation theory is A. Focus on the most important goal at a particular time. This approach is about efficiency in personal development throughout the life course. Baltes' theory highlights the need for individuals to select personal goals strategically, optimize their efforts to achieve these goals, and compensate for any losses they might encounter, particularly as they age. This aligns with the concept of prioritizing goals that are most crucial and achievable, given one's current resources and circumstances.