use the Doppler effect. drive in a jet-fueled car. cross Nevada's Black Desert. break the sound barrier on ground.
I gave my students this multiple choice question: In Nevada's Black Desert on October 15, 1997, Andy Green traveled a measured distance at an average speed of 339 meters per second in a jet-powered car called "Thrust." Andy was the first person to

Only one answer is correct among these 4 choices:
- use the Doppler effect.
- drive in a jet-fueled car.
- cross Nevada's Black Desert.
- break the sound barrier on ground.

Could you tell me which one is correct?

break the sound barrier on ground.