The cost baseline is usually not changed unless?

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Option (C) Thee revision is the result of an approved scope change

Thanks for the invite.

Though a project may have multiple cost base lines to measure different aspects of cost performance but unless there is an approved change in the project scope cost base line is not changed, usually. So I go with option C .

Option-C................................................

Budget updates are changes to an approved cost baseline. These values are generally revised only in response to approved changes in project scope

C. could be the answer because it is approved change but A is a good option  

Cost Base line  is the  sum of  cost estimate & contingency reserve.  if  any significant changes to these two may affect the cost base line. Base line is the bench mark to measure perfomance. Compare the values in the Base line cost and Cost fields to determine if the task is still on track within your budget.It is an approved budget usually in a time distribution format used to estimate, monitor, and control the overall cost performance of the project.

think it is option a mostly A. the basis for the original cost estimate is found to be false and the project must be re-estimated , but other options may have imact

A. the basis for the original cost estimate is found to be false and the project must be re-estimated.B. significant cost deviations have been reported and it is desired to have future cost reports be based on an “as of” date.C. the revision is the result of an approved scope change.D. the time baseline is also changed

Letter B - Significant and cost deviations have been reported and it is desired to have future cost reports be bassed on an "As of Date".