Hello and thanks for your question!
I would say that for this one, you probably were in too narrow a mindset. Remember, they just want to know which one of the following *COULD* be a setup. That means that if the 6 setups you found are correct, then one of them should match with the correct answer. They are not asking you to derive the one and only correct answer.
In general, for this kind of question - and this is usually the first question on most LSAT game types - you don't want to address the question by generating every possible combination you can think of because that is pretty time consuming. Instead, you should go through the rules one at a time, applying them to each answer choice. In an answer choice violates a rule, you can strike it out and no longer have to check that one. Eventually only one answer choice will not be eliminated - every other one has to violate a rule or some combination of the rules.
I hope this helps. Always feel free to follow-up with more questions!