Answer:
D). The older adults might be convinced to participate in experiments involving a fountain of youth.
Step-by-step explanation:
The inference that the author recommends through various sections of this passage is that 'the older adults might be convinced to participate in experiments involving a fountain of youth' as it helps them in developing as well as enhancing their skills like learning, decision-making, coping skills, becoming more independent, etc.. These skills would eventually assist them in preventing the potential risks of homelessness, unemployment due to low attainment of education. Thus, the involvement in such experiments offers another opportunity for the older youth to learn and succeed.