Could be true except least compatible or violates a principle. The most common reasoning structure by far will be conditional logic. Most correct answers will either contradict a conditional rule or they'll contradict some available inference that we could have made by combining ideas. When it comes to trap answers, you could lump them all together and just say, well, they all could be true. But when we think about how the test writers design them, we could get a little bit more granular. Some things are unopposed meaning they certainly fit within the information we were given.