Which sentence is written in a style that makes it appropriate for an audience made up of highly trained auto mechanics? the engine roared to life as i turned the key, and people on the sidewalk stopped to stare at the car. my first car was red with a white racing stripe, and the chrome on its sides shined in the bright arizona sunlight. i checked the carburetor and noticed the butterfly valve was cracked, which threw off the engine's air intake. the car was in bad shape; it had two flat tires, a broken taillight, and there were dents all over its hood.

The answer is "I checked the carburetor and noticed the butterfly valve was cracked, which threw off the engine's air intake."

Explanation:

An audience made up of highly trained auto mechanics is an audience capable of understanding technical language. People in general may own a car but not necessarily know what the car parts are called and what function each of them has. So, most people would not comprehend the sentence  "I checked the carburetor and noticed the butterfly valve was cracked, which threw off the engine's air intake", but auto mechanics would. The other sentences, on the other hand, focus on simple details such as the car color, or the flat tires. They do mention a couple of car parts - taillight and hood -, but these are simple and known of the general public.

first of paragraph? and second of statment?

don't submit such stupid questions!