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

answer: a star is a source of light through nuclear reactions

question: What sentence would provide a factual answer to this question: "Which two events are guaranteed to each happen in a 24 hour cycle?"

answer: the sun setting occurs once per day

question: What sentence would provide a factual answer to this question: "A plant will get more light energy"

answer:
as the size of a leaf increases , the amount of sunlight absorbed by that leaf will increase