Final answer:
The nurse should provide education about MRSA to the students.
Step-by-step explanation:
The nurse should take the action of providing education about MRSA to the four students who are returning to school after being diagnosed with MRSA. The purpose of this education is to inform the students about the infection, its transmission, and appropriate prevention measures. By educating the students, the nurse can help prevent the spread of MRSA to other students and staff at the school.