Final answer:
The most famous company associated with Bentonville and operating in an office building south of it is Wal-Mart, a retail giant emblematic of the post-industrial service economy in the US.
Step-by-step explanation:
The company that is the most famous for its operations in an office building south of Bentonville is Wal-Mart, known for being a giant in the retail sector. Wal-Mart has established itself as a dominant force in the retail landscape, particularly in small towns across the United States such as Ruston, LA. The company's practices with regards to its employees are often cited as a representation of the broader service economy within the post-industrial landscape of the US.