question: What sentence would provide a factual answer to this question: "During photosynthesis, plants produce sugar that may help with their what?"

answer: sugars are transported from the leaves to the roots of a plant

question: What sentence would provide a factual answer to this question: "Which is hotter?"

answer: a hot substance is a source of heat

question: What sentence would provide a factual answer to this question: "Which would freeze last?"

answer:
adding salt to a solid decreases the freezing point of that solid