Which of the following is a step before administering a medication?

Checking the medication administration record (MAR) is an essential step before administering medication. The MAR provides vital information about each student's medication regimen, including the names of medications, dosages, times of administration, and any special instructions. By reviewing the MAR, the caregiver can confirm that they have the correct medication for the right student at the appropriate time, thereby ensuring safety and adherence to the prescribed treatment plan. This step is crucial in preventing medication errors and ensuring that the students receive the appropriate care they need.

Other options, while potentially relevant in certain contexts, do not serve as immediate prerequisites for medication administration. Closing the pharmacy, consulting with the principal, or discussing with other staff members does not directly impact the readiness or correctness of administering a specific medication at a given time. Therefore, checking the MAR stands out as the primary action that directly influences the safe and effective administration of medications.