Explain the main difference between recorded history and pre history?

Difference between History and Prehistory is explained here in detail. This topic is important from the perspective of History Syllabus. Human prehistory is the period between the use of the first stone tools and the invention of writing systems. History is an umbrella term that relates to past events as well as the memory, discovery, collection, organization of past events. The difference between History and Prehistory elaborated here can help the UPSC Civil Service exam aspirants to understand the basics better and know their comparisons thoroughly.

d is the best answer for this question.

b. ensure mutual protection from communism.

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