Correct Answer: Schools
  

Solution : The correct answer is (b) Schools

Social infrastructure refers to the physical structures and facilities that support social services and contribute to the overall well-being and development of a community or society. Schools are a prime example of social infrastructure as they provide educational services and play a crucial role in the intellectual, social, and emotional development of individuals. Schools serve as centers for learning, knowledge dissemination, and skill development, contributing to the overall progress and growth of a society. They also serve as community hubs, fostering social interactions, and providing a foundation for the development of future generations. While bridges, highways, and power plants are essential infrastructure components, they primarily fall under the category of physical infrastructure, focusing on transportation and energy systems.