The LIFO conformity rule states that:
Multiple Choice
A. if LIFO is used for tax purposes, the external financial statements must also use LIFO.
B. if FIFO is used for tax purposes, the external financial statements must also use FIFO.
C. if LIFO is used for tax purposes, the external financial statements must use FIFO.
D. if FIFO is used for tax purposes, the external financial statements must use LIFO.

Generally, The LIFO conformity rule states that if a company uses the Last-In, First-Out (LIFO) inventory valuation method for tax purposes, it must also use LIFO for financial reporting purposes. This means that the company must use the same inventory valuation method for both its tax returns and its external financial statements.

The LIFO conformity rule is based on the idea that a company's tax and financial reporting should be consistent and that using different methods for each could lead to discrepancies and confusion.

It's worth noting that the LIFO conformity rule only applies to companies that use LIFO for tax purposes. If a company uses a different method, such as First-In, First-Out (FIFO) or Average Cost, for tax purposes, it is not required to use the same method for financial reporting.