Correct Option (D)
The passage indicates that while various sectors like construction, unregistered manufacturing, and e-commerce contribute to employment, they are insufficient to meet India's projected job demand. It specifically highlights that "Only those sectors that drive domestic demand such as health and education can comfortably fill the other half" of the required jobs. Health and education are core components of the social sector. Therefore, the passage implies that increased investment or spending in these social sectors is essential for generating a substantial number of jobs.
Incorrect Options:
Option (A) is not implied. The passage describes the existing pattern of labour migration from agriculture to other sectors but does not advocate for measures to reduce rural-to-urban migration. Its focus is on the quality and availability of jobs in the destination sectors.
Option (B) is not implied as the primary message. While the passage notes that jobs in construction and unregistered manufacturing are "not markedly better," its central argument is about the need for alternative and more productive job creation, rather than solely improving conditions within these specific sectors.
Option (C) is incorrect. The passage explicitly states, "Services, where labour tends to be most productive, are not generating the additional jobs the country needs," directly contradicting the assertion that the service sector has been reducing unemployment.