There Are Three Basic Causes for Change in Projects and Their

There are three basic causes for change in projects and their budgets and/or schedules. Which of the following is not one of these?

A) Errors the cost estimator made about how to achieve the tasks identified in the project plan.
B) Inflation causes significant changes to the cost of labor and/or materials.
C) The project team or client learns more about the nature of the scope of the project or the setting in which it is to be used.
D) A new law is passed, a trade association sets a new standard, a governmental regulatory agency adopts a new policy.