Need help with question 22, 23, 24. I tried answering as best as I can but is it accurate?Which of the following is a period cost?

A. the amount of depreciation expense recognized because of the use of plant assets such as building and equipment

B.the cost of direct labor

C.costs incurred to provide customer service such as the operation of a 800 phone line to trouble shoot product problems and to answer questions about product warranties

D.the cost of materials used to make a product when those materials are an insignificant part of the finished product

QUESTTON 21 Which of the following is a manufacturing overhead cost? overtime premiums paid to plant workers the use of direct materials in the making of a finished good cost of materials that can be traced to individual products in an economically feasible manner labor cost of plant workers that can be traced accurately and easily to a particular product QUESTION 22 Which of the following is a period cost? the amount of depreciation expense recognized because of the use of plant assets such as building and equipment the cost of direct labor costs incurred to provide customer service such as the operation of a 800 phone line to trouble shoot product problems and to answer questions about product warranties the cost of materials used to make a product when those materials are an insignificant part of the finished product QUESTION 23 Which of the following is included in product cost for pricing and product-mix decisions? cost of capital sunk costs opportunity costs marketing costs QUESTION 24 Which of the following is not an inventoriable cost of a manufacturer? Property taxes on plant Plant depreciation incurred Sales commissions paid to sales representatives who sell the products made by the manufacturer