As the Strategic Focus Feature in Chapter 2 Describes, Wal-Mart

As the Strategic Focus feature in chapter 2 describes, Wal-Mart is the nation's largest employer and second-largest company by revenue. What does this suggest in terms of the industry structure?

A) Wal-Mart can exert considerable pressure as a buyer.
B) Wal-Mart's presence in a market reduces rivalry.
C) Wal-Mart has no substitutes.
D) Wal-Mart is immune from the threat of new entrants.