The correct answer is option 'D', The Eighth Five Year Plan.

The Five Year Plans in India are comprehensive economic plans that outline the country's development goals and strategies for a five-year period. These plans are formulated by the Planning Commission, which is a government body responsible for planning and implementing development policies.

Recognizing human development as the core of all development efforts is a crucial aspect of inclusive and sustainable development. It emphasizes the importance of improving the well-being and quality of life of individuals and communities. In this context, the Eighth Five Year Plan in India gave significant importance to human development.

Below is a detailed explanation of why the Eighth Five Year Plan recognized human development as the core of all development efforts:

1. Introduction of the Eighth Five Year Plan:
The Eighth Five Year Plan was implemented from 1992 to 1997. It aimed at achieving a balanced and sustainable development in various sectors of the economy. The plan focused on reducing poverty, improving education, health, and social welfare, and enhancing the overall quality of life.

2. Emphasis on Social Development:
The Eighth Five Year Plan recognized the need to address social issues and uplift the marginalized sections of society. It aimed to promote social justice, gender equality, and inclusive growth. The plan focused on improving access to education, healthcare, and other social services for all sections of society.

3. Human Resource Development:
The Eighth Five Year Plan gave considerable importance to human resource development. It emphasized the need for skill development, vocational training, and education to enhance the productivity and employability of the workforce. The plan aimed to create opportunities for individuals to acquire skills and knowledge, leading to better employment prospects.

4. Poverty Alleviation and Rural Development:
The Eighth Five Year Plan recognized the importance of poverty alleviation and rural development. It aimed to reduce the incidence of poverty and improve the standard of living in rural areas. The plan focused on promoting agricultural development, rural infrastructure, and rural employment generation programs to uplift rural communities.

5. Health and Nutrition:
The Eighth Five Year Plan prioritized the improvement of healthcare services and nutrition. It aimed to reduce infant mortality rates, improve maternal health, and combat major diseases. The plan focused on strengthening healthcare infrastructure, promoting preventive healthcare, and enhancing access to quality healthcare services.

6. Environmental Sustainability:
The Eighth Five Year Plan also emphasized the importance of environmental sustainability. It aimed to integrate environmental concerns into development planning and promote sustainable resource management. The plan focused on conservation of natural resources, pollution control, and sustainable development practices.

In conclusion, the Eighth Five Year Plan in India, implemented from 1992 to 1997, recognized human development as the core of all development efforts. It emphasized social development, human resource development, poverty alleviation, rural development, healthcare, and environmental sustainability. By prioritizing these aspects, the plan aimed to improve the overall well-being and quality of life of the Indian population.