Passage A: A rebuttable presumption directs a court to accept a provisional conclusion once a basic fact is shown, unless the opposing party produces sufficient contrary evidence. It shifts a burden within the inquiry but does not make the conclusion irrebuttable. Passage B: Proof that a properly addressed notice was mailed created a presumption that it arrived. The recipient overcame the presumption with building records showing that all mail was returned during a week-long closure. Which option correctly characterizes one passage's general account and the other's case-specific discussion in the context of legal presumptions?