The Pradhan Mantri Gram Sadak Yojana (Option 2) is the earliest launched scheme among the given possibilities. It was introduced by the Government of India in the year 2000 with the objective of connecting rural areas with cities and towns through standard roadways.

Option 1, Deendayal Antyodaya Yojana, was launched in 2014 with the intention to provide employment opportunities to the rural and urban poor.

Option 3, Saansad Adarsh Gram Yojana, was launched in 2014 and aims to transform villages into model villages, with the idea being to improve the standard of living and quality of life in rural areas.

Option 4, Deendayal Upadhyaya Grameen Kaushalya Yojana, initiated in 2014, aims to train rural youth who are poor and provide them with jobs.

In conclusion, the Pradhan Mantri Gram Sadak Yojana (Option 2) is indeed the earliest launched scheme based on the years they were introduced.