The National Initiative for Developing and Harnessing Innovations (NIDHI) is an umbrella scheme that aims to promote and support young and aspiring innovators in India. This initiative focuses on nurturing innovative ideas and providing necessary resources to transform them into successful ventures.

Option 2, scientific research, is not the correct answer. While NIDHI may indirectly support scientific research through its focus on innovation, its primary goal is to support innovators and their ideas rather than specific scientific research projects.

Option 3, primary health care, and option 4, primary education in rural areas, are also not correct answers. While these are important areas for development, NIDHI specifically focuses on promoting innovation and entrepreneurship among young individuals rather than directly addressing healthcare or education-related issues.

Therefore, the correct answer is option 1, young and aspiring innovators, as NIDHI aims to provide opportunities and support for talented individuals with innovative ideas and help them in realizing their entrepreneurial aspirations.