Recently, the latest data analysis of a certain national aerospace agency confirmed that the signal detected by Mars probe "Curious" on Mars in June 2013 was a methane signal. Some people have inferred that this methane may originate from living in Gaelic. The organisms in the crater indicate that there must be life on Mars. Which of the following, if true, would most challenge the above inference. ['Methane has always been seen as a sign of life on a distant planet.', 'The methane signal detected on Mars has been consistently stable.', 'The methane on Earth will quickly disappear into the atmosphere after being produced by organisms, which proves that the methane on Mars must have been released shortly.', 'The methane found on Mars may be due to the meteorite impact, causing the methane gas in the storage ground to be continuously released.']