A Study by the Government Accountability Office Found

A study by the Government Accountability Office found:

A) substantial market power in the four largest accounting firms. The Big Four audit 97 percent of all public companies in the United States that have sales over $250 million.
B) evidence of collusion among the top accounting firms in the United States.
C) conclusive evidence that consolidation in the accounting industry led to an increase in audit fees and a decline in independence.
D) All of the above.