Black Friday Is Well-Known as the Start of the End-Of-The-Year

Black Friday is well-known as the start of the end-of-the-year holiday shopping season in the U.S. retail market. Stores offer a variety of up-to-the-minute deals to attract customers into the store between certain hours. Customers have begun to utilize electronic PDAs and cell phones to keep up with the myriad sales and deals in the stores. Which condition would MOST threaten customers' use of mobile technology while shopping in stores?

A) Customers, upon entering stores, were body-scanned with magnetic detectors.
B) Store sales were broadcast over loudspeakers.
C) There were a limited number of Wi-Fi transmission hotspots inside the stores.
D) Lighting inside of stores was too dim.
E) Store personnel were not as helpful to customers with smartphones in their hands.