Answer:
b. A job-order costing system uses a single work-in-process account, while a process-costing system has a work-in-process account for every process.
Explanation:
In job order costing the cost statement is prepared for a single job, although it may include different processes but the cost is determined for this specific single job, cumulatively.
Whereas under the process costing system, the cost statement is prepared for each particular process.
Thereby this difference makes it obvious that there is one work in process under job order costing method and that there are as many work in process accounts as many processes in process costing system.