Which city does the airport code PDX correspond to?

The airport code PDX corresponds to Portland International Airport, located in Portland, Oregon. Each airport is assigned a unique three-letter code to simplify identification in flight operations, booking, and baggage handling. In this case, "PDX" is derived from the city's name, specifically incorporating the "PD" from Portland and the "X" as a common designation used in airport codes that often signifies a specific location or origin. Therefore, B accurately reflects the correct city associated with the PDX code.

For the other options, while they represent actual airports and cities, they do not share the PDX designation. Each has its own distinctive airport code: Phoenix, AZ, uses PHX; San Diego, CA, is represented by SAN; and Tampa, FL, corresponds to TPA. This system helps avoid confusion and ensures clarity among travelers and airline staff.