Final answer:
The principal rationale for writing off variances from standard costs to Cost of Goods Sold is to prevent asset values from including the cost of inefficiencies, which could inflate inventory values on the balance sheet.
Step-by-step explanation:
The student's question pertains to why some accountants believe variances from standard costs should be written off to Cost of Goods Sold or another income statement account when such standards are current. The option that represents the principal conceptual rationale for this treatment is (B) To allocate such variances implies that asset values on the balance sheet (i.e., inventories) contain the cost of inefficiencies.
The rationale behind this choice is related to the accurate portrayal of asset values. If variances are not written off, inventories could potentially be inflated due to included costs that actually reflect inefficiency rather than the actual cost to produce the product. Writing off variances to the income statement ensures that reported asset values do not carry forward inefficiencies as part of their value.