The correct answer is B.
OBJ-3.6.1: A change budget is a sum of money that the customer and supplier agree will be used to fund the cost of requests for change, and possibly also their analysis costs. Unless the anticipated level of change on a project is low, it is advisable for a budget to be set up to pay for changes. This arrangement can reduce the number of trivial exceptions arising in projects where the frequency of requests for change is forecast to be high. Including a change budget provides for a more realistic expectation of the overall costs/timeframe of the project.