Question

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

Explanation:

Air pollution can irritate the respiratory system. People with asthma already have a sensitive respiratory system. High schoolers, people in their 20s, and marathon runners (assuming no pre - existing respiratory conditions) are generally less sensitive to air pollution compared to asthmatics.

Answer:

asthmatics (people with asthma)