The correct answer is (c), service sector.
The service sector is the largest contributor to India’s GDP, accounting for over 50% of the total. The sector includes a wide range of activities, such as finance, insurance, real estate, trade, hotels, restaurants, transport, communication, and business services.
The service sector has been growing rapidly in recent years, driven by factors such as economic liberalization, rising incomes, and urbanization. The sector is expected to continue to grow in the future, and is expected to account for a larger share of the GDP.
The other options are incorrect.
(a) Agriculture and allied sectors account for about 15% of India’s GDP. The sector is still important for employment, but its share of the economy has been declining in recent years.
(b) Manufacturing, construction, electricity and gas account for about 30% of India’s GDP. The sector has been growing rapidly in recent years, but it is still smaller than the service sector.
(d) Defence and Public administration account for about 3% of India’s GDP. The sector is important for providing essential services, but it is a relatively small part of the economy.