Question

which of the following is a group that is especially susceptible to air pollution? high schoolers marathon runners asthmatics (people with asthma) people in their 20s

Explanation:

Air pollution can exacerbate respiratory conditions. Asthmatics have compromised respiratory systems, so they are especially susceptible to the negative effects of air pollution. High schoolers, marathon runners (while exercise can affect exposure, not as inherently susceptible as asthmatics), and people in their 20’s don't have the same underlying respiratory vulnerability as asthmatics.

Answer:

asthmatics (people with asthma)