In the context of applying our analytical skills to arguments, what is the purpose of the tool ...

In the context of applying our analytical skills to arguments, what is the purpose of the tool called argument mapping ? Mapping is used ________.
 
  (a) to display how someone's reasoning flows from initial statements to the conclusion the person regards as being supported by those statements
  (b) to help understand why people always look up the answer for things that they should be able to figure out themselves
  (c) to reveal how to get from one area of town to another area of town that may or may not be difficult to find
  (d) to display the differences between how children and adults make decisions