Which of the following is an inherent difficulty in determination of the results of operations on an interim basis? a. Costs expended in one interim period may benefit other periods. b. Depreciation...

Which of the following is an inherent difficulty in determination of the results of operations on an interim basis?

a. Costs expended in one interim period may benefit other periods.

b. Depreciation on an interim basis is a partial estimate of the actual annual amount.

c. Cost of sales reflects only the amount of product expense allocable to revenue recognized as of the interim date.

d. Revenues from long-term construction contracts accounted for by the percentage-of completion method are based on annual completion, and interim estimates may be incorrect.