Would you please let me know the correct answer?

Would you please let me know the correct answer?

The following statements about inventories for tax purposes are all true, except:

• Inventories may not be valued on the basis of the "base stock" method, the prime cost method, nor the variable cost method.
• Taxpayers that meet the $25 million gross receipts test may account for inventories as either non-incidental materials and supplies or as they do for financial accounting purposes.
• The use of the LIFO method invariably results in less taxable income than book income.
• A strict adherence to GAAP is no guarantee that the IRS will allow a write-down of inventories.