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B. A set of rules and regulations to govern, often referred to as a constitution.

Explanation:

Constitutional government implies that it must follow a constitution (hence constitutional government).

A constitution by definition is "the supreme law of the land", typically referring to the rights of the people, and limits of the government.

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The periods before the invention of writing and the keeping of historical records is called  Prehistoric Period or Prehistory

Explanation:

Prehistory is defined as an era or period that happened before the existence of invention of writing and maintaining the records in a society. It is believed that history began from 3200 BCE as the Archaeologists have found the written records from this period.

It also believed that humans in the present anatomical form have been living on this planet for more than 200,000 years but due to lack of written record it is almost impossible to say about the culture, civilisations, etc. of the man that existed for so many years on this earth.