12. A 35-year-old woman is complaining of itchy, red, and wa…

12. A 35-year-old woman is complaining of itchy, red, and watery eyes and sneezing with clear nasal discharge. She denies a cough, fever, sore throat, or facial pain. She has a history of type 1 diabetes mellitus, and she had asthma when she was a child. The cause of this conjunctivitis is: