Answer:
A. by helping them stay healthy enough to do well in school .
Step-by-step explanation:
Productivity at school or at work depends, besides acquired knowledge, on factors such as well-being and physical health. Thus, health literate people have the knowledge to maintain the body's nutrient balance and mental health. A strong body combined with a healthy mind will have the foundations for a more productive life in all fields of life, including the educational and work processes.