Final answer:
Sentence A: "Food on your plate must be converted into a mashed-up, gooey liquid for your digestive system to split it up into parts that your body can use: proteins, carbohydrates, fats, vitamins, and minerals."
Step-by-step explanation:
The sentence from the article that provides the best support for the statement that the digestive system converts meals into body fuel is sentence A: "Food on your plate must be converted into a mashed-up, gooey liquid for your digestive system to split it up into parts that your body can use: proteins, carbohydrates, fats, vitamins, and minerals." This sentence explains that food needs to be broken down into smaller parts so that the body can absorb and use the nutrients.