What Makes It Ironic That the Average Worker Employed in the Bay

What makes it ironic that the average worker employed in the Bay Area's service sector cannot afford to live there?

A) The nation's top technology and software companies, including Facebook, Google, and Microsoft, are headquartered there and have led the region in unprecedented innovation and wealth.
B) American-born white workers cannot afford to live there, while undocumented immigrants can take full advantage of public housing programs in this area.
C) Workers in the technology industry have to commute long distances to their jobs because living in San Francisco is undesirable due to its high crime rate.
D) Workers in the lucrative high-tech industries cannot afford the high prices of automobiles and gasoline and have to find alternative methods of transportation to get to their jobs.