The correct sequence of economic sectors in terms of their contribution to the GDP of India in decreasing order is option 1: Service—Industry—Agriculture.

The service sector refers to businesses that provide services rather than producing tangible goods. This sector includes activities such as retail trade, banking, finance, transportation, and healthcare. In recent years, the service sector has been a major contributor to India`s GDP, accounting for a significant portion of the economy.

The industry sector includes manufacturing, construction, and mining activities. This sector plays a crucial role in the economic development of a country by producing goods and creating employment opportunities.

The agriculture sector includes activities related to farming, fishing, and forestry. Although agriculture used to be the primary sector in the Indian economy, its contribution to the GDP has declined over the years as other sectors have grown.

Therefore, the correct sequence is service, industry, and agriculture, as the service sector currently contributes the most to India`s GDP, followed by the industry sector, and then the agriculture sector.