- Tue Nov 29, 2022 3:16 pm
Great question! So, we're told that regarding Roberta:
I --> T
LT --> T.
We're then told that she lost her keys, so we definitely know that she is tired. Her yawning is irrelevant; having lost her keys is sufficient enough to conclude she's tired. But then the argument claims she is "almost certainly irritable." In other words, the argument is incorrectly concluding that because she is tired, then she is probably irritable. But this is a mistaken reversal of the first statement. Robert might not be irritable at all, even though she's tired. Answer choice (E) describes this perfectly: being tired is a necessary condition for being irritable, but the author treated it is a sufficient one.
D is close, because it describes a mistaken reversal, but it refers to the wrong term. The author doesn't assume that because Roberta's tired, that that is why she lost her keys. The author only commits a mistaken reversal once, when they claim that because Roberta is tired, she is probably irritable as well. Hope this helps!