The answer is B, a set of beliefs and laws, because of what they consist of, like "Thou shalt not bear false witness against thy neighbor" and so on.
The New Model Army was created in February 1645 by Parliament as it felt that a professional army would be more successful against the king's army. ... Cromwell had already made his mark at the Battle of Marston Moor where his cavalry had done a lot of damage to the king's army.
The big three formalized the plan to divide Germany into four zones of occupation.
I Believe the answer is: Personal records
Personal record revers to a form of primary source which information is derived from the observation or the experiments that being done by the source writers themselves. In most cases, personal records are created by experts on the relevant fields.
It helped them deal with the lack of certain resources.