Of the three manufacturing costs, which one is the most difficult to assign to a cost object?

Direct materials.

Manufacturing overhead.

They are all equally difficult to assign.

Direct labour.Which one of the following is a common activity base used to calculate the predetermined overhead rate? a$.$ the number of jobs completed b$.$ indirect labor costs c$.$ direct labor dollars d$.$ number of months to complete jobs Will give thumbs up$,$ Just need correct answers