Recall the Application About the Size of Wal-Mart to Answer

Recall the Application about the size of Wal-Mart to answer the following question(s) . During 2008, Wal-Mart's sales were approximately $374 billion, or roughly 2.6 percent of U.S. GDP, and its cost of sales was $286 billion.
-According to this Application, why is the value of Wal-Mart's 2008 sales NOT an accurate measurement of its actual sales impact on the U.S. economy?

A) The sales figure did not account for chain-weighted inflation measurements.
B) The sales figure includes the value of purchases from other firms.
C) The sales figure did not take into account the recession of 2008.
D) The sales figure was in nominal, not real, dollars..