Councillor Miller opposes all proposals to raise taxes.
Evidence
CM opposes any proposal that raises taxes. CP support raising funding for schools, which are funded entirely by property taxes.
Conclusion
CC's proposal to increase school funding by raising property taxes will be opposed by CM and supported by CP.
Evaluate
I'm not exactly sure what they want us to identify as the flaw here. Miller will oppose this proposal, because he opposes all proposals that raise taxes.
The looseness would probably have to do more with not knowing whether Philopoulos will definitely support CC's proposal. It seems like someone could be broadly in favor of increased funding for schools but still opposed to one specific proposal that involves increased funding for schools.
Goal
I'd be looking for something like this: - Entity 1 always rejects X. - Entity 2 likes Y. - Thus, Entity 3's proposal to do Y via doing X will be rejected by Entity 1 and accepted by Entity 2.