Correct option is A
The correct answer is Upper Primary Stage
According to the National Curriculum Framework (NCF) 2005, social science topics are independently introduced to students at the Upper Primary Stage. This stage is crucial for laying the foundational knowledge in social sciences, aiming to acquaint students with basic concepts in history, geography, political science, and economics. Introducing social sciences at this stage is designed to foster an understanding of societal structures, cultural diversity, and civic responsibilities among young learners, thereby building a groundwork for more complex studies in these fields at higher levels of education.