Final answer:
Amy's doctor will likely prescribe an antihistamine to treat her allergic reaction to pollen which causes red, itchy eyes, a symptom of allergic rhinitis.
Step-by-step explanation:
After a day spent gardening, Amy developed red, itchy eyes as an allergic reaction to pollen, a condition often associated with allergic rhinitis or hay fever. The symptoms she is experiencing include watery eyes, itchiness, swollen tissues, and possibly sneezing. In such cases, the immune system mistakenly reacts to pollen, which is a common allergen, as if it were a pathogen. When Amy visits her doctor, the likely prescription will be for an antihistamine medication. Antihistamines are specifically designed to reduce or block the histamines that cause allergy symptoms such as the itchy, red eyes Amy is experiencing.
Therefore, the correct answer to what type of medication Amy's doctor will prescribe for her allergic reaction to pollen is C. antihistamine.