Question ID:PT88 S4 Q26 Passage:Current evidence indicates that there is no methane on Planet 253. If that is the case, it is certain that there is no life on Planet 253. Since microbes always produce methane, if there is no methane then there are no microbes. Stem:The conclusion drawn above follows logically if which one of the following is assumed? Correct Answer Choice:DChoice A:There is, in fact, no methane on Planet 253. Choice B:If methane exists on Planet 253 then we would be able to detect its presence. Choice C:If there is no methane currently on Planet 253 then there has never been methane on Planet 253. Choice D:If there are no microbes on Planet 253 then there is no life on Planet 253. Choice E:If there is methane on Planet 253 then there must be life on Planet 253.