Final answer:
The most engaging sentence in the passage is the one that creatively plays with the common saying about April showers, using rhyme and humor to discuss the disadvantages of rain for driverless cars.
Step-by-step explanation:
The sentence from the passage that makes the best use of engaging word choice is “So instead of April showers bringing flowers, any rain would bring on the pain.” This sentence uses a play on the common saying 'April showers bring May flowers' to creatively express how rain, instead of being beneficial, could cause problems for driverless cars. The choice of words here is engaging because it adds a touch of humor and a memorable rhyme, which contrasts the more matter-of-fact tone of the other sentences.