Question

select the best evidence to support the statement that allergies can vary in their severity. allergies are the 6th leading cause of chronic illness in the u.s....more than 50 million americans suffer from allergies each year. allergies are an overreaction of the immune system to substances that generally do not affect other individuals. these substances, or allergens, can cause sneezing, coughing, and itching. allergic reactions range from merely bothersome to life - threatening. some allergies are seasonal, like hay fever. allergies have also been associated with chronic conditions like sinusitis and asthma. anyone may have or develop an allergy from a baby born with an allergy to cow’s milk, to a child who gets poison ivy, to a senior citizen who develops hives after taking a new medication. adap from national institute of environmental health sciences, “allergens & irritants”

Explanation:

To support the statement that allergies can vary in their severity, we need to find evidence that shows a range of severity. The sentence "Allergic reactions range from merely bothersome to life - threatening" directly shows this range. The first piece of evidence is about the prevalence of allergies, not severity. The third piece is about who can have allergies, not severity.

Answer:

Allergic reactions range from merely bothersome to life - threatening.