Why is history open to ongoing and changing interpretations?

a) changing values limit interpretation.
b) new evidence is not available.
c) primary sources are determined to be unreliable.
d) revisionists are overruled by traditionalists.
e) traditional interpretations are questioned by revisionists.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

on the whole, dickens has shown the french revolution and its this site might you. good at his job, and the subject matter he chose,