Which of the Following Examples Would Most Likely Be Subject

Which of the following examples would most likely be subject to selection bias?

A) a study that randomly sampled 100 passengers at Chicago O'Hare International Airport to get their opinions about decreased legroom on commercial airplanes
B) a study that randomly sampled 100 hunters in Minnesota to determine if newly implemented state hunting limits would reduce the number of hunting trips they took in the state each year
C) a study that randomly sampled 100 tourists of legal drinking age on the Las Vegas Strip to determine the average amount they spend each day on alcoholic beverages while in Las Vegas
D) a study that randomly sampled 100 people issued speeding tickets on the New Jersey Turnpike to determine if drivers believe the New Jersey Department of Transportation should raise the current 65 mph speed limit to 75 mph