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."
-The nurse calls the parents of the affected students to report the finding of conjunctivitis.One parents questions why antibiotics would be ordered without a culture and identification of a specific organism.Which of the following statements by nurse is correct?  

A) Antibiotics are effective at clearing viral and bacterial infections.
B) Antibiotics are given prophylactically,even if viral conjunctivitis is suspected because we use clinical signs for diagnosis.
C) Antibiotics are given to prevent superinfection while the eye's natural defenses are compromised.
D) Antibiotics are given while we wait for the child to be seen by a physician for more extensive diagnostic workup.