Correct Answer: Improve maternal and child health

Solution : The correct answer is (B) Improve maternal and child health

The main objective of the National Health Mission (NHM) in India is to improve the availability, accessibility, and quality of healthcare services, with a particular focus on maternal and child health. The NHM aims to reduce maternal and infant mortality rates, prevent and control communicable diseases, strengthen healthcare infrastructure and human resources, and provide equitable and affordable healthcare services to all sections of the population. It does not specifically address air pollution, renewable energy sources, or transportation infrastructure.