The most serious effect of the poor sanitation and contaminated water supplies in tenements was

a public-health problem.

Explanation:

According to the World Health Organization (WHO), the main objective of sanitation is the promotion of human health, as many diseases can proliferate due to the absence of this service.

Poor water quality, inadequate waste disposal, poor waste disposal and polluted environments are the result of poor sanitation and crucial factors for disease proliferation.

The diseases with the highest incidence due to exposure to these environments are: Leptospirosis, Bacterial Dysentery, Schistosomiasis, Typhoid Fever, Cholera, Parasitoids, in addition to the worsening epidemics such as Dengue.

WHO data show that 88% of diarrhea deaths worldwide are caused by inadequate sanitation and poor water supplies. Of these, 84% are children. In Brazil, in 2008, 15 thousand Brazilians died each year due to diseases related to poor sanitation.

In 2014, WHO stated that every dollar invested in sanitation saves $ 4.3 invested in global health. The information shows how closely health and sanitation are. Investing in one affects the expenses of the other.

explanation: d

to force terrorists groups to stop attacking western targets using massive military force.