The top priority of the school administration should be student attendance.
Conclusion (should)
The top priority of the school administration should be student attendance (making sure students attend classes).
Evidence
No matter how good the teachers, texts, and facilities are, none of these do any good if few students come to school.
Evaluate / Goal
We want a normative / prescriptive conclusion, like "you should make X your top priority". And the reason why should sound something like,
X is the linchpin of the whole endeavor. The other things have no meaning if X isn't true.
Let's get rid of the four answers that match that.