Final answer:
Avery's town issued a Boil-water advisory due to contamination of the water supply by harmful pathogens. This advisory aims to prevent waterborne diseases by informing residents to boil water before consumption. option (B)
Step-by-step explanation:
The advisory issued by Avery's town is a Boil-water advisory. This type of advisory is released when water supplies are contaminated with pathogens and water is not safe for drinking without proper treatment, such as boiling, which kills harmful microorganisms.
This situation can arise when there is a presence of harmful bacteria, viruses, protozoa, or parasites which may lead to waterborne diseases. These diseases can have severe health impacts and are often caused by inadequate sanitation or the contamination of drinking water supplies. According to the World Health Organization (WHO), a significant percentage of diarrheal diseases, responsible for millions of deaths each year, are caused by unsafe water supplies. It is crucial to follow such advisories to prevent the spread of diseases and protect public health.