In the study of history the available documents for studying a certain period is unchanging over time.
Option: B
Explanation:
History is the study of events and phenomena over space and time. Space means where the particular incident is taking place. Time means the period of occurrence of particular event. A certain period suppose the period of sultanate or mughal empire requires some documents, records to be studied in detail.
And these available documents, records can never be changed over time. History is study of things over changing space and time. Archaeological evidences also keep some valid documents for studying historical events.
Answer:
The answer is number four.
It was a reaction from the colonist for Great Britain taxing the colonies so much. It led to more tension because it was a straight forward act against Great Britain, and one that was slightly violet. It was showing Great Britain that the colonist were definitely fed up with how they were being traeted by the mother country.
I believe the answer is B. sugar.