Which of the following symptoms might suggest a diagnosis of allergic conjunctivitis?

Tearing is a hallmark symptom of allergic conjunctivitis. This condition is characterized by an inflammatory response to allergens such as pollen, dust mites, or pet dander. When the eyes come into contact with these allergens, the body's immune system reacts by releasing histamines, leading to increased tear production as a protective mechanism. This excess tearing is often accompanied by other symptoms such as itching, redness, and swelling of the conjunctiva.

In contrast, dryness of the eyes is typically associated with conditions like dry eye syndrome, where there is insufficient tear production. A burning sensation can occur in various ocular conditions, including dry eye and other forms of conjunctivitis, but it is not specific to allergic conjunctivitis. Cloudiness in vision is more indicative of issues related to the cornea or lens, rather than an allergic response. Thus, tearing is the most relevant and indicative symptom for a diagnosis of allergic conjunctivitis.