A School Nurse at a Public Elementary School Notes a Number

A school nurse at a public elementary school notes a number of students presenting to his office with similar symptoms. The students are complaining of itchy, watery eyes with white, milky drainage. They appear to have red and inflamed sclera and conjunctiva. Some students report the symptoms in both eyes, while others are experiencing it in one eye. A number of the students report that they woke up the feeling that their eyes were "glued-shut."
-What is the nurse's priority intervention?

A) Send the students home
B) Educate the affected students about hand hygiene practices
C) Obtain prescriptions of antibiotic drops for the affected students
D) Coordinate thorough cleaning of the classrooms