Explanation:

- Social infrastructure: It refers to the systems and structures that support the quality of life, like education, healthcare, and housing that collectively contribute to social well-being.

- Infrastructure: This is a broad term covering all facilities and services necessary for economic activities, transportation, communication, water, and energy. These help bolster the economic and social prosperity of a country.

- Economic infrastructure: These components specifically promote economic development, such as roads, bridges, and power supply, crucial for economic growth.

- None of the above: This does not apply as 'Infrastructure' encompasses all activities and facilities for socio-economic development.