Answer: The key contrast is depicted of the complex imagery
Explanation: point
The two words Bradbury uses repeatedly in this scene are "The beetle". The repetition adds to the suspense of the scene. Each time "the beetle" is repeated the reader can feel the car getting closer and closer. Because the sentences are very short and similarly structured, they speed up the pace of the scene just like the car is picking up speed.
I’m not sure what the certain scenario is for this question, but I do know “liberation” means “free from imprisonment”. Perhaps the character has achieved something that has been holding them back from success, or cut off ties from someone who influences them negatively, or quite literally escaped something/someone that had captured them. I hope this helped.