Verbal logic and argument evaluation
Read the passage as a set of premises before importing outside knowledge. An aptitude exercise can stipulate a fictional policy, classification or causal hypothesis. Those stipulations do not establish actual law or operational practice. Separate a premise, an intermediate conclusion and the final claim. Ask whether the question requests what must follow, what could happen, an assumption or a weakness; these are different standards. One compatible example establishes possibility but does not establish necessity.
For a conditional P implies Q, P is sufficient for Q and Q is necessary for P. Its contrapositive is not-Q implies not-P. The converse Q implies P and inverse not-P implies not-Q do not follow in general. An inclusive or permits both alternatives, whereas an explicit exclusive or permits exactly one. Negating all members having a property gives at least one exception, not every member lacking it. Track quantifier scope carefully.
For an argument about a real-world pattern, separate correlation from a causal claim. A common cause, selection effect or reverse direction can explain an association. A proposed assumption must connect the evidence to the conclusion, rather than merely restating the conclusion. In a weakening question, select evidence that bears on that connection. Test the strongest remaining alternative with a small counterexample, and record precisely which premise it violates.