Explanation:

- Option 1: India

- India has a significant population but faces challenges in healthcare and infrastructure.

- Life expectancy is rising but still trails behind some other countries.

- Option 2: China

- China boasts a robust healthcare system improving over years.

- Life expectancy in China is often higher than in other developing nations.

- This option is correct.

- Option 3: Pakistan

- Pakistan has faced numerous challenges in improving healthcare facilities.

- Life expectancy remains lower compared to China and India.

- Option 4: Both A and B

- While both India and China have significant populations, China's life expectancy is higher.