On December 31, 2013, Gifts Galore, Inc. appropriately changed its inventory valuation method from weighted-average cost to FIFO method for financial statement and income tax purposes. The change will result in a $1,800,000 increase in the beginning inventory at January 1, 2013. Assume a 40% income tax rate. The cumulative effect of this accounting change on beginning retained earnings is:
a ) $0.
b) $1,800,000.
c) $1,080,000.
d) $720,000.