Step 1: Understanding the Concept:
The question asks for the causes of health problems in India. Health is a complex issue influenced by multiple socio-economic and environmental factors.
Step 2: Detailed Explanation:
All the given options are significant contributors to India's public health challenges:
(A) Growing population: A large and dense population puts immense pressure on healthcare infrastructure, sanitation, clean water supply, and nutrition, making it harder to provide adequate services for everyone.
(B) Pollution: Air and water pollution are major causes of illness. Air pollution leads to respiratory diseases, while water pollution causes a high incidence of water-borne diseases like cholera and typhoid.
(C) Infectious disease: Despite progress, infectious diseases like tuberculosis, malaria, and diarrhoeal diseases continue to be a major cause of sickness and death.
Since all these factors are interconnected and play a major role, the most appropriate answer is (D).
Step 3: Final Answer:
Growing population, pollution, and infectious diseases are all major reasons for health problems in India.