​Healthier, more educated workers tend to be more productive. Greater overall productivity per hour worked is a fundamental component of​ long-term economic growth.​However, many very successful individuals often find few opportunities in their own developing​ countries, and leave them for industrial countries.By improving health and​ education, developing countries can generate economic​ growth, and increase incomes. This will help combat the prevalence of educated people leaving their home countries for opportunities elsewhere. That​ is, it will combatA. the brain drain.B. corruption.C. communism.D. political reform