Answer:
B. An accounting firm would likely use a job order costing system
Explanation:
The job order costing is the cost which is depended upon the various job needs that reflects the differential costing based on the instructions given by the customer.
On the other hand, the process costing deals with different processes that are held in the company premises.
As we cant say which costing is used but the job order costing is used by the accounting firm as it gives the various services depending upon the customer needs and for that separate fees is to be charged.