C.) It allows to understand the cause behind a fact.
Explanation:
There are five logical questions, that allow for a better understanding of a situation and eventually to find the facts behind it, these questions are
"who, what, where, when and how"
The Zachman Framework includes the why question.
"Why" is also really important, as it is helpful to define the reason behind the action that was taken, or that will be taken, therefore is useful to fully understand a situation or to set goals for future actions.