This is the only answer with incorrect grammar. I'm guessing that the underlined portion is "path and paved." All of the other answers work in a sentence.
It just doesn't make sense when you say this: "The county cleared this path paved it with packed gravel, so they would have a peaceful place to hike and bike."
It's missing an "and" to separate the independent and dependent clauses.
Our cells need glucose to function, which is gained from the nutrients in the food. Oxygen is gained from breathing, so it has nothing to do with food.
