Final answer:
Life span developmentalist Paul Baltes and his colleagues believe that successful aging is related to three main factors: physical health, cognitive functioning, and social engagement.
Step-by-step explanation:
Life span developmentalist Paul Baltes and his colleagues believe that successful aging is related to three main factors: B) Physical health, cognitive functioning, and social engagement. As we age, maintaining good physical health becomes crucial in order to carry out daily activities and maintain independence. Cognitive functioning, such as memory and problem-solving skills, also play a role in successful aging. Lastly, social engagement and maintaining social connections contribute to overall well-being and positive aging.