He three categories of manufacturing costs comprising the total cost of work in process are direct labor, direct materials, and
a. accounting salaries expense
b. direct expenses
c. factory overhead
d. selling expenses

c. factory overhead

Explanation:

The manufacturing cost comprises direct labor cost, direct material cost and the factory overhead cost. All that cost which are required to manufacture the product is known as manufacturing cost

In mathematically,  

Manufacturing cost = Direct labor cost + Direct material cost + factory overhead cost  

These manufacturing costs are reported in the income statement

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