I believe the answer is a.
Answer:
negative externality
Explanation:
In simple words, negative externality refers to the loss that an unrelated third party experiences due to any economic transaction that occurs between the other two independent entities.
Under this concept the two parties do not deliberately effect the third party and generally that third party do not get any chance to tackle the loss before it actually happens. Diseases happening to general public due to pollution by factories is the prime example of negative externality.
The actual answer is D because risk factors are anything that increases the risk of someone getting sick or disease
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Poor health and decreased appetite