Statement 2 lays down a rule that covers every teacher without exception, and statement 4 places X squarely inside that category by stating X is a teacher.
Applying a rule that covers every teacher to a specific person confirmed to be a teacher is a direct, valid step, it immediately gives statement 5, that X needs training.
None of the other option sets keep a consistent subject running through both premises into the stated conclusion; they either stay general throughout or shift to an unrelated term like students.
Therefore, the correct answer is 2, 4, 5.
Statement 2, "All teachers need training," is a universal rule covering the entire category of teachers. Statement 4, "X is a teacher," is a singular statement placing one specific individual inside that category. Applying a universal rule to a specific member of the category it governs is a standard valid syllogistic step, producing a singular conclusion about that individual. Let's check each option against this:
Applying the universal rule that all teachers need training to the specific fact that X is a teacher is the only pairing that validly produces a conclusion about X, exactly statement 5.
Therefore, the correct answer is 2, 4, 5.