Compared with Adults, Children Represent a Group That Is Especially

Compared with adults, children represent a group that is especially vulnerable to environmental hazards for the following reasons, except:

A) Their immune systems are still developing.
B) They may be exposed more often to toxins in the outdoor air.
C) They may be exposed more often to toxins in the soil.
D) They spend more time indoors.
E) They may inadvertently ingest toxic substances.