Which of the following airports is in California and uses the code SFO?

The airport code SFO corresponds to San Francisco International Airport, which is located in California. This code is part of the International Civil Aviation Organization (ICAO) and International Air Transport Association (IATA) system for identifying airports. San Francisco International Airport is well-known as a major international gateway, and its code SFO is widely recognized in airline operations, travel itineraries, and various aviation-related contexts. The other options refer to different cities in California, each of which has its own distinct airport codes, such as SJC for San Jose International Airport, SNA for John Wayne Airport in Santa Ana, and SMF for Sacramento International Airport.