Technological Change Is a Key Reason Why Wal-Mart Has Become

Technological change is a key reason why Wal-Mart has become one of the largest firms in the world. Which of the following is a change in technology implemented by Wal-Mart?

A) Wal-Mart developed a supply chain that allows it to manage inventories efficiently.
B) Instead of buying goods it sells from other companies, Wal-Mart makes many of these goods in its own factories.
C) Wal-Mart employs hundreds of scientists and engineers who develop new cost-saving techniques.
D) Wal-Mart hires managers from many of the top business schools in the United States.